or with a spotty character described for crystals from the

612，5 990Purple 8 1330Dark Purple 7 840Pink 70 570Light purple pink 45 540 Na， East Antarctica. Geology of Ore Deposits. 2020. Vol. 62. N 7。

35]， mgPink Purple 8 1146Pink Purple 5， Kotova E.L. Rare element composition of beryl from the Sherlovaya Gora deposit。

Moscow。

spectroscopic characteristics， Mikhalsky E.V. Modeling of Mineral Parageneses and Thermobarometry of Metavolcanic Rocks of the Ruker Group in the Southern Prince Charles Mountains。

720w 820/896/925P1， a)， 3050 cm-1; the amplitude of peak 3154 (a3i54) is given in the table. This set is typical for a diamond without B-defects from the Arkhangelskaya and Karpinsky-I pipes [18]. All diamonds with a pink and violet-pink shade are medium-nitrogen and high-nitrogen with a very low degree of nitrogen aggregation into the B-defect (Fig.4， Minibaev R.S. Ontogenetic guidelines for choosing a formation pattern of platinum mineralization in zonal clinopyroxenite-dunite massifs of the Urals. Zapiski Rossiiskogo mineralogicheskogo obshchestva. 2019. Vol. 148. N 2， 694， Northwestern Russia. Minerals. 2020. Vol. 10， spectroscopy， Yakovlev D.A. et al. Atlas of primary diamond deposits in the Yakutia kimberlite province. Mirnyi: ALROSA， but the opposite effect is observed. Samples 1784-8-1， N2， the concentration of which is proportional to the amplitude of the aB band。

p. 118-129 (in Russin). DOI: 10.30695/zrmo/2019.1483.09 21.Pashkevich M.A.， Skublov S.G. et al. Zircon in mantle eclogite xenoliths: a review. Geological Magazine. 2021. Vol. 158. Iss. 8， both between crystals and within the volume of some samples. Peaks at 700， p. 1207-1220. DOI: 10.1016/j.diamond.2010.06.015 5.Byrne K.S.，0 0.1210.8 0 113.5 0 26.16.5 0 410.150.12 a3154， Jaques A.L.。

DHaenens-Johansson U.F.S.， Chapman J.G.， 700， 926 nm are recorded in the spectra of most crystals; in some samples - 523， Mirny。

b) should make the crystal darker， p. 584-598. DOI: 10.1134/S1075701520070053 36.Kozlov A.V.， its colour is lighter and more pink. The opposite correlation， then the phonon wing of this system determines the shape of the spectrum when excited by 785 nm， 2021， N2， p. 243-257. DOI: 10.1007/s00710-018-0587-6 13.Eaton-Magana S.。

H3 are observed in the PL spectra upon excitation with a 405 nm laser. When excited by a 488 nm laser， 18。

Kalinina V.V. Spectroscopic evidence of the origin of brown and pink diamonds family from Internatsionalnaya kimberlite pipe (Siberian craton). Physics and Chemistry of Minerals. 2020. Vol. 47. Iss. 20. DOI: 10.1007/s00269-020-01088-5 8.King J.。

Skublov S.G.， Russia)， p. 101-109 (in Russian). DOI: 10.31857/S0869605520060155 24.Zinchuk N.N.， shifting the resulting colour closer to warm pink. At first glance， both pink crystals without B defects and crystals with a high proportion of nitrogen in the B form (from the Argyle mine) have C defects that contribute to the perception of pink colour. The ratio and concentration of nitrogen and hydrogen centres in diamonds from the Lomonosov mine are close to those in purple diamonds from the Internationalnaya kimberlite pipe. The 550 nm absorption band is the reason for the pink colour not only in the studied diamonds of the Arkhan-gelskaya kimberlite pipe， Krivovichev S.V.， or absorption systems with zero-phonon lines at 575 and 637 nm [6， Текст научной работы на тему «Pink-violet diamonds from the Lomonosov mine: morphology， 10， p. 1292-1302. DOI: 10.1017/S1431927612013542 10.Howell D.， and not the origin of the diamond and the petrochemical properties of its host rocks. Keywords: diamond; nature of colour; photoluminescence; nitrogen centres; infrared spectroscopy; electron paramagnetic resonance; Arkhangelsk diamond province; Lomonosov mine Acknowledgment. The work was carried out under the TslTIS research project N 121061600049-4 with the support of the Russian Science Foundation。

P1， Russia). The authors declare no conflict of interests. ， respectively)， Fedortchouk Y.。

often multiple. The colour is distributed unevenly throughout the crystals; it is mainly concentrated in layers - lamellas， 11， Breeding C.M. et al. Natural-Colour Purple Diamonds from Siberia. Gems and Gemology. 2008. Vol. 44. N 1， Ilalova R.K. Morphometric parameters of sulphide ores as a basis for selective ore dressing. Journal ofMining Institute. 2022. Vol. 256， India， p. 352-377. DOI: 10.5741/GEMS.54.2.352 14.Taylor W.R.， for which Ntot = 1010 ppm. All studied diamonds belong to group IaA (A B)， p. 26-41. DOI: 10.5741/GEMS.37.1.26 12.Smit K.V.。

p. 1518-1527. DOI: 10.2138/am-2015-5044 11.Shigley J.E.， p. 99-109 (in Russian). DOI: 10.33623/0579-9406-2021-1-99-109 32.Serebryakov E.V.， i.e.， a peak at 612 nm， nature of colour. Journal of Mining Institute. 2023. Vol. 263， Hill V. et al. Identification of the structure of the 3107 cm-1 H-related defect in diamond. Journal of Physics: Condensed Matter. 2014. Vol. 26. N 145801. DOI: 10.1088/0953-8984/26/14/145801 29.Vasilev E.A. Luminescence of plastically deformed diamond in the range 800-1050 nm. Journal of Applied Spectroscopy. 2019. Vol. 86. N 3， spectroscopy， respectively [3， https://orcid.org/0009-0009-8495-9289， studies were carried out using infrared (IR) and photoluminescence (PL) spectroscopy， 21]. For most samples， Saint Petersburg， 14]. The source for the colour of these crystals is studied in much more detail than for diamonds from the Argyle pipe。

and is described in detail in [6。

giving the colour a warm shade. Violet， wavy stripes of colour distribution， Liebske C.。

the Nb/Na concentration ratio is greater than unity (IaA B)， crystals with C-defects are characterized by the H2 PL system [1， 5] - either a broad structureless band in the region of 550 nm。

geological， Kriulina G.， the paramagnetic centres that dominate in intensity in the P1-W7 pair are in bold. The W7 centre is a ring consisting of four carbon atoms and two nitrogen atoms located in opposite areas. According to modern concepts， Russia)， and similar diamonds also come from placer deposits in Venezuela [10]. The total nitrogen content in them is usually low， 926 926， in turn。

Smit K.V.， 9860.6 W7， Eliseev A.P. et al. Destruction of nitrogen B1 centres during plastic deformation of natural diamonds of 1aB type and the behaviour of the resulting defects during PT treatment. Doklady Akademii nauk. 2004. Vol. 399. N 4， Howell D. et al. Deformation-related spectroscopic features in natural Type Ib-IaA diamonds from Zimmi (West African craton). Mineralogy and Petrology. 2018. Vol. 112. Iss. 1， 16]， formed as a result of plastic deformation and presumably being centres of pink colour， 720w。

8]. The pink colour of the first type is heterogeneous. In crystals it is localized in individual lamellae induced by plastic deformation [9-11]. The pink colour of the second type is less intense， 694， and a microwave radiation power of 0.2 and 5 mW. The samples were adjusted in L4 || H according to the angular dependence of the P1 centre; shootings were made with significant accumulation (to 75 scans). Research results. The studied samples are represented by dodecahedroids and crystals of combination shape with manifestations of octahedron faces. Pink crystals of octahedral habit in the Arkhangelskaya pipe are rare; their finds during the entire period of mining of the pipe are singular. The morphology of the crystal surface is specific. Its main feature is the strong influence of plastic deformation (Fig.1， p. 1-21. DOI: 10.3390/geosciences11010007 16.Gavrilchik A.K.。

cold-shaded crystals are characterized by the dominance of the W7 paramagnetic centre. The formation of pink and pink-violet diamonds is of a convergent nature: the presumed M2 colour centres are concentrated in microtwin lamellas， it had an amplitude of less than 1 cm-1， Post J.E.， its concentration in thin plates in twin orientation [6， habitus [17。

where low titanium content is considered as an indicator of high pressure during the kimberlites formation. Most kimberlite bodies in the Yakutia diamond province have a moderate content of titanium oxide (TiO2 1-2.5 wt.%) and large depths of origin of both diamonds [20， Vyatkin S.V.。

EPR) characteristics of diamonds from the Lomonosov mine (Arkhangelskaya pipe) with a unique pink， 7。

and 1797-3， W7， pink crystals differ not only from colourless and yellow ones， p. 34-54. DOI: 10.1134/S0869591111010024 20.Voitekhovskii Yu.L. Once again about the Curie dissymmetry principle. Zapiski Rossiiskogo mineralogicheskogo obshchestva. 2019. Vol. 148. N 3， Plastically Deformed Pink Diamonds. Microscopy and Microanalysis. 2012. Vol. 18. Iss. 6， according to which the determining factors are the ratio and concentration of structural impurities in the diamond， which is significantly higher than the typical range for Argyle pipe diamonds (less than 250 ppm). At the same time。

P1 (C) and M2 centres are identified by the EPR， 33]， the observed empirical pattern of diamonds distribution according to the presence of pink colour with TiO2 content in diamond-bearing rocks is a consequence of the influence of the main factor - pressure and temperature conditions. An example of the influence of PT conditions is the Lomonosov mine (Arkhangelskaya and Karpinsky-1 pipes)， Researcher， 10]. The results of the absorption study in the IR region are fully consistent with the identified colour distribution model. All samples have a nitrogen content of about 500-1500 ppm， Koptil V.I. Typomorphism of diamonds of the Siberian Platform. Moscow: OOO Nedra-Biznestsentr， Skublov S.G.， which made it possible to obtain an absorption spectrum in the visible region. The morphology of the crystals was studied under a Motic SMZ-143 binocular with a UV illuminator box (365 nm). The recording of IR spectra was carried out on a Vertex-70 Fourier spectrometer (Bruker) with a Hyperion-1000 microscope. The total nitrogen concentration (Ntot) and a Fig. 1. Studied diamond crystals from the Arkhangelskaya pipe: photos and images of photoluminescence of crystals when excited by a 405 nm laser 1 - sample 1784-8-1; 2 - sample 1784-41-2; 3 - sample 1784-41-6; 4 - sample 1784-41-11; 5 - sample 1784-41-14; 6 - sample A0058-1; 7 - sample 1797-3 the fraction of nitrogen in the form of B defects (Nb， 16]. Based on the fact that the M2 centres also have a deformation nature [16]， Post J.E.， colour is concentrated in thin layers along {111}， p. 532-536 (in Russian). 31.Vyatkin S.V.， its thermal history。

Pearson D.G. Carbon and Nitrogen in Mantle-Derived Diamonds. Reviews in Mineralogy and Geochemistry. 2022. Vol. 88. Iss. 1， corresponding to the hydrogen-containing centre VN3H [28] (Fig.4， p. 527-538. DOI: 10.31897/PMI.2022.76 34.Garanin V.K.， and Brown Diamonds: Band of Many Colours. Gems and Gemology. Vol. 54. N 4， Senior Researcher， Alekseenko A.V. Reutilization prospects of diamond clay tailings at the Lomonosov mine。

but homogeneous. This nature of colour was found in some historical diamonds of India. Diamonds of this type have very low nitrogen concentrations [2。

32， H3， which are characterized by high mobility [6]. Previously， 14]， table). The B band was not detected in the spectra of two crystals. In the spectra of three crystals， and the high intensity of the 926 nm line is noted. In samples 1797-3 and 178441-14， pink and pink-violet diamonds are found in the Lomonosov mine and in the Internationalnaya pipe. Previously。

M2 H3， Russia 3 Empress Catherine II Saint Petersburg Mining University， and a wide structureless band with a maximum at about 720 nm is recorded in the spectra of all samples. The relative intensities of these systems vary widely， Stepanov S.Yu.， and nitrogen-vacancy systems H3 and H2 are identified from the luminescence spectra. The pink colour is heterogeneous， it seems logical to have a positive correlation between the intensity of the ab 500 300 3320 3360 fisr 100 H， such crystals are extremely rare， 2021. 248 p. DOI: 10.1007/978-3-030-35717-7 18.Melnik A.E.， Komsomolskaya kimberlite pipes [24， therefore， M2 m。

31] and proto-kimberlite magmas [25， Leading Researcher， 21-23]， a system with maxima at 868， p. 480 (in Russian). 26.Fedortchouk Y.， EPR， Rose T.， 787， but also in the diamonds of the Argyle lamproite pipe， which has a deformation nature. It is likely that the M2 centre appears in the visible range as a colour centre and is responsible for the emergence of the 550 nm absorption band [3， it should be taken into account that W7 centres are formed in a much wider temperature range compared to M2 centres and are found much more often in different types of diamonds. The above-mentioned division of the studied crystals according to colour intensity fully corresponds to the compositional features of the paramagnetic centres in them. For example， with a local decrease in the symmetry of the crystal， 700， with the nitrogen atoms located along the (001) direction。

39]. Conclusion. The studied pink and pink-violet diamonds from the Lomonosov mine are medium-and high-nitrogen， Jannucci C. Exceptional Pink to Red Diamonds: A Celebration of the 30th Argyle Diamond Tender. Gems and Gemology. 2014. Vol. 50. N 4， p. 512-525. DOI: 10.31897/PMI.2021.4.4 33.Duryagina A.M.。

PL， Garanin V.K. et al. Morphology and defect and impurity composition of diamonds from the Zapolyarnaya pipe. Vestnik Moskovskogo universiteta. Seriya 4. Geologiya. 2021. N 1， 491 nm， Vasilev E.A. Pink-violet diamonds from the Lomonosov mine: morphology， 2003， Chacko T.， two pink samples (A0058-1， b)， Briddon P.R.， but also from brown crystals， only the nitrogen ^-defect and the 3107 cm-1 line with satellites。

P1， Butler J.E. Cathodoluminescence of Natural， the Nb value is less than 22 %. A high total nitrogen content (Na Nb)， C-defects in the studied diamonds are detected only by EPR. C system (main peak at 1130 cm-1) does not appear in the IR absorption spectra. In the diamonds of the Lomonosov mine C-defects affect the perception of violet and pink colours: absorption in the short-wave part of the spectrum reduces the proportion of cold tones in the colour balance， a). All crystals are formed by a tangential growth mechanism and have a thin-layered structure， Rakhmanova M.I.， 895， Luiten A.N. Infrared microspectroscopy of natural Argyle pink diamond. Diamond and Related Materials. 2012. Vol. 23， Zapolyarnaya， for example， 25]. Sample 1784-8-1 was polished after spectroscopic studies， N2， and association with certain mines [3， cm 17， i.e.， Russia; ALROSA， Evgenii A. VASILEV3 1 Lomonosov Moscow State University， https://orcid.org/0000-0002-5054-575X(Lomonosov Moscow State University， 694， several mechanisms for the formation of pink and purple colours were proposed， Talovina I.V.， which indicates a very low concentration of B-defects; they are not observed in the spectra. Results of crystal studies using IR， Ellison R.K. Discovery and Mining of the Argyle Diamond Deposit， a). A mineralogical description was made， 7]. The pink， Chapman J.， Ardon T.， 1784-41-2， 720w。

and the degree of its aggregation is high， Sergei V. VYATKIN1， 16]. Pink， expressed in the surface morphology by a sharp concentric hatching around the L3 axes. Lamellae of plastic deformation are also observed in two or three crystallographic directions (Fig.2). Superimposed sharp shifts of lamellae of plastic deformation penetrate the entire volume of the crystal and are observed on the surface from opposite sides in the form of parallel stripes and steps， 8]. It should also be noted that there is a similarity in the uneven distribution of colour caused by the 550 nm band for diamond crystals from both kimberlite and lamproite deposits. A comparison of this factual material allows us to assume about the convergent nature of pink diamonds。

cm-1 EPR centres* lex = 488 nm** lex = 787 nm**0.16 P1， 952， Volokovikh T.S.， coinciding in orientation with the bands of plastic deformation (see Fig.2). Areas with bending， Smit K.V. et al. Natural-Colour Pink， Arkhangelskaya， leads to a more saturated violet colour. Also， p. 493-506. DOI: 10.1016/j.epsl.2018.11.025 27.Stachel T.， 7]. The absorption systems at 575 and 637 nm belong to the nitrogen-vacancy centres NV0 and NV-， which was found in all samples. The H2 defect is an ionized H3 centre [12]. Apparently， to 250 ppm， 1784-41-6 have uniform green PL of the H3 system， Piazolo S. et al. Pink colour in Type I diamonds: Is deformation twinning the cause? American Mineralogist. 2015. Vol. 100. N 7， 720w， ppm1015 1308009901330840492 108420 120 Nb， p. 512-515. DOI: 10.1007/s10812-019-00850-0 30.Nadolinnyi V.A.， 20]. Many works associate the defect and impurity composition of diamonds [14， Australia. Gems and Gemology. 2001. Vol. 37. N 1， and the least intensive systems are in italics. *** 720w - wide band with a maximum at 720 nm， and Canada [8]. The total nitrogen content in crystals of this type is from 300 to 1200 ppm or more， a. In the table， a) Ntot is in the range of 9501500 ppm. This correlation is violated by the weakly coloured crystal 1784-8-1 (1 in Fig.1， M2 H3， 34， Mirny。

4， 612， the external appearance of diamond crystals， 12]. In nature， and PL spectroscopy methods are given in the Table. In the IR absorption spectra of most samples， Candidate of Geological and Mineralogical Sciences， an intense H3 system with a zero-phonon line at 503 nm。

grant N 21-77-20026. Received: 29.04.2023Accepted: 11.10.2023Online: 27.10.2023Published: 27.10.2023 Introduction. Diamonds in Fancy Pink and Fancy Purple-Pink colours are among the most expensive ones. The combination of a pink shade or colour with gem quality is so rare that it makes such diamonds unique. There are only six mines in the world with small but consistent finds of pink and purple diamonds. In Russia， additional absorption in the short-wave part of the visible region (see Fig.4， are lighter (see Table). This can be seen in Fig.1， p. 69-82. DOI: 10.31857/S0869605521020052 17.Garanin V.， Palamarchuk R.S.， as well as electron paramagnetic resonance (EPR). The sys-tematics of structural defects is given according to [17， 612， as well as in spots [13， and PL spectroscopy StudySamples 1784-8-11784-41-21784-41-61784-41-111784-41-14A0058-11797-3 Diamond colour Weight， and conditions of plastic deformation， but the conditions for their occurrence have not yet been determined. Several types of pink diamond colour are known [1-3]. They differ in their absorption spectra [4， Republic of Sakha (Yakutia)， 488。

spectroscopy， p. 715-723. EDN NYGZOX Abstract. The article presents the results of the first comprehensive study of mineralogical and spectroscopic (IR， P1， as well as to assess the composition of structural defects and their possible effect on the pink colour of the crystals. Research materials and methods. Seven pink diamond crystals of various shades and saturations from batches of commercial mining of the Arkhangelskaya pipe in 2010-2020 were studied. (Fig.1， 612， p. 809-875. DOI: 10.2138/rmg.2022.88.15 28.Goss J.P.。

EPR spectrum of sample A0058-1 (Fig. 5， as well as the general similarity of mineralogy and defect and impurity composition of diamonds [17。

with a total nitrogen content in the range of 500-1500 ppm，。

which determines its pink colour。

being one of the main markers of this process [3， Luiten A.N. Photochromic charge transfer processes in natural pink and brown diamond. Journal of Physics: Condensed Matter. 2013. Vol. 26. N 3. N 03551. DOI: 10.1088/0953-8984/26/3/035501 2.Eaton-Magana S.， 19]， the presence of C-defects in pink diamond was revealed when studying the photochromism of crystals with a high proportion of B-defects [1，986P1， b). The matte surface (fine shagreen) of some blocks is explained by the intersection of plastic deformation structures (see Fig.3). Thus。

a， Republic of Sakha (Yakutia)。

pink-violet colour. It is shown that all crystals belong to the IaA type， Evgenii A. Vasilev， often with a violet shade， the formation of which requires certain PT conditions for the plastic deformation (relatively low temperatures and directed pressure). The appearance of pink diamonds in a particular mine depends to a greater extent on the presence of these conditions than on the origin of the diamond and the properties of its host rocks. 1.Byrne K.S.， nature of colour Galina Yu. KRIULINA12H。

and an increased concentration of C-defects (N) in crystals of the octahedron - dodecahe-droid series are typical for most colourless and yellow diamonds from the Lomonosov mine [17。

p. 410 (in Russian). 39.Golubev Yu.K.， the Southern Urals). Geosciences. 2021. Vol. 7。

a wide band appears in the region of 550 nm， as well as a side absorption wing in the short-wave part of the spectrum。

W7 centres are formed from A centres during plastic deformation of diamond crystals， which according to the petrochemical classification [17] belong to low-titanium type rocks (TiO2 1 %)， using the examples of mines in Australia (Argyle)， and for more intensely coloured purple ones (2-5 in Fig.1， M2， with a low degree of aggregation of nitrogen centres and belong to the IaA B group. In all crystals。

787， 926 926， 17] (Internationalnaya。

Golubeva Yu.Yu. Development prospects of the mineral resource base of diamonds in the Arkhangelsk region. Mineral Resources of Russia. Economics and Management. 2020. N 1， and the saturation of the pink-violet colour. However， N3 defects [12。

Cartigny P.， 9860.44 W7， Kondrashov I.A. Kimberlites and Lamproites: Criteria for Similarity and Differences. Petrology. 2011. Vol. 19. N 1， a). The reason for this relationship is revealed with further magnification: visually observed bands of plastic deformation mark crystal areas with a microt-win structure (see Fig.2， and in samples 1784-41-11 and 1784-41-14 there are regions with dominance of both red luminescence (720 nm band) and a brighter green one. The results of studies using IR， a band with a maximum at around 4160 cm-1 is observed; the Table shows its amplitude. This band is the amber centre; it is typical in the spectra of brown crystals with signs of plastic deformation. The IR absorption spectra of four crystals reveal additional peaks at 3311， EPR， concentrated in thin layers along {111}， McElhenny G.， Karpinsky-1 pipes)， concentrated in narrow twin layers. It is presumably caused by the previously describedM2 centres. The colour shade is affected by the content of P1 paramagnetic centres (C-defect). A positive correlation is observed between the colour saturation and the intensity of W7 paramagnetic centres. A convergent model of the formation of pink diamonds is assumed， 9]. Their main difference is the concentration of nitrogen in Ntot and the degree of its aggregation Nb， 986W7， Researcher， Table) [16]. The paramagnetic centre P1 is a single substituting nitrogen atom (C-defect). Due to the low concentration， a low degree of aggregation of centres into the 5-form。

Saint Petersburg， pink-violet crystals were found in the Arkhangelskaya and Internationalnaya kimberlite pipes [3]， 904， Piven G.F. Prospecting models of primary diamond deposits of the north of the East European Platform. Journal ofMining Institute. 2022. Vol. 255。

Popov V.A. Distribution of Trace Elements Controlled by Sector and Growth Zonings in Zircon from Feldspathic Pegmatites (Ilmen Mountains， Organova N.I. Plastic deformation of natural diamonds by twinning: evidence from X-ray diffraction studies. MineralogicalMagazine. 2012. Vol. 76. Iss. 1， 9860.28 W7。

p. 299-318. DOI: 10.31897/PMI.2022.49 38.Ustinov V.N.， Bassim N.D. et al. Spectroscopic and microscopic characterizations of colour lamellae in natural pink diamonds. Diamond and Related Materials. 2010. Vol. 19. Iss. 10， including during the movement of diamond-bearing rocks to the surface. High temperature and lower pressure contributed to the plastic deformation through the mechanism of dislocation sliding with the formation of brown diamonds， 787， nature of colour» Research article Pink-violet diamonds from the Lomonosov mine: morphology。

is found in mines of Russia [3。

an unambiguous sign of the petrochemical similarity of the mentioned diamond pipes - low TiO2 content - becomes understandable in the light of [19， with a low degree of aggregation. The colour is heterogeneous， despite the spatial， Garanin K.， and the Grib mine， a) has a noticeably higher intensity of the lines of the P1 centres (single substitutions of carbon with nitrogen) compared to the lines of the W7 centre， Candidate of Geological and Mineralogical Sciences， obtained after polishing sample 17848-1， often wavy， 12]， Russia 2ALROSA， associated specifically with the NV0 and NV- centres. On the contrary， Kriulina G.Yu.， physical properties and paragenesis of inclusion-bearing diamonds from Yakutian kimberlites. Lithos. 1990. Vol. 25. N 1-3， McCammon C. Diamond destruction and growth during mantle metasomatism: An experimental study of diamond resorption features. Earth and Planetary Science Letters. 2019. Vol. 506， low-titanium kimberlites are close to lamproites. A similar formation trend is assumed - olivine lamproites of the Argyle pipe - Al-kimberlites of the Zolotitsky field - Al-kimberlites of the Internationalnaya pipe [8， were found in all samples. Paramagnetic centres P1 were also found in all samples (Fig.5， were not found in the studied samples. The layers of intense pink colour are confined to the lamellae of plastic deformation revealed in the topography， N2， for crystal 1784-41-14 (Fig.5， high relative contents of hydrogen-containing VN3H centres were noted. M2 centres， differing in morphological features， which belongs to the low-titanium type of kimberlites and contains pink-violet diamonds， and the position of the band maximum depends on the size [14]. The presence and relative content of hydrogen-containing centres was determined in accordance with [28]. The absorption spectrum in the visible region was obtained using a LOMO MSFU-K micro-scope-spectrophotometer. PL spectra were recorded on an InVia spectrometer (Renishaw) with excitation by lasers of 405， 926 926， due to the presence of C-defects. Discussion of the results. The pink colour in the studied samples is heterogeneous. It is concentrated in thin layers along {111}， 720w***， 787， areas with internal stresses and characterized by anomalous birefringence are clearly visible. Signs of linear 0.1 mm b a 0.02 mm ■ ■ Fig.2. Plastic deformation planes in pink-violet diamond 1784-8-1: a - boundary of the ground area and the crystal surface (macrophotography); b - emergence of a plastic deformation band on the crystal surface (micrograph) colour dichroism appear when viewed in different orientations relative to the directions with the most pronounced lamellae of plastic deformation. Visual photoluminescence (under a 365 nm UV lamp) of moderate intensity is manifested in yellowish or yellowish-bluish shades (see Fig.1， p. 56-64. DOI: 10.5741/GEMS.44.1.56 4.Gaillou E.。

Sergei V. Vyatkin，5 850Pink Purple 5。

16]. The centre is formed by two nonequivalent nitrogen atoms separated by three carbon atoms， 5。

higher temperatures of post-crystallization annealing [24， p. 1290-1310. 15.Levashova E.V.， Bogatikov O.A.， Korolev N.M.， P1， 787， the absorption band at 550 nm cannot yet be reproduced when growing artificial diamonds [13]. Pink diamonds due to the absorption band with a maximum of 550 nm。

16]. The second type of pink diamond (IaA B)。

in which the EPR centre P1 (C-defect) is most pronounced， Gladkov A.S. Geological and structural characteristics of deep-level rock mass of the Udachnaya pipe deposit. Journal of Mining Institute. 2021. Vol. 250， 31]. Thus， similar in configuration to an octahedron with reduced symmetry [6， 694 nm. If the 787 nm line is recorded in the spectrum excited by a 488 nm laser。

3154， 612。

20]， Anstie J.D.， SouthEastern Transbaikalia. Zapiski Rossiiskogo mineralogicheskogo obshchestva. 2021. Vol. 150. N 2。

25。

A0058-1。

%) were calculated using known proportionality coefficients. The lower limit for the detection of nitrogen in B form is 5-7 %. The B band with a maximum in the region of 1360 cm-1 also indicates the presence of B defects. Planar B defects (platelets) are composed of interstitial carbon atoms， and in the Argyle lamproite pipe. Based on a number of petrological and geochemical characteristics [18， 24]， the colour of which is also determined by the 550 nm absorption band， which differ from them in many characteristics [2， b)， 15]. There is no consensus among researchers about the mechanism of the appearance of pink colour [4， 3144。

p. 115-130 (in Russian). DOI: 10.30695/zrmo/2019.1482.08 37.Ustinov V.N.， the ratio of nitrogen in the form of B-centres Nb (four nitrogen atoms and a carbon vacancy) to the total concentration of nitrogen - in the form of B and ^-centres Na (two neighbouring nitrogen atoms in carbon positions of the crystal structure). The first type is known from diamonds from the Argyle pipe (Australia) [5。

p. 23-28 (in Russian). Authors: Galina Yu. Kriulina， 983， characteristic of 25-50 % of crystals from the Udachnaya， a modulation frequency of 100 kHz， NW Russia. Switzerland: Springer， Spetsius Z.V.， M2 H3， in a twin orientation with respect to the main volume of the crystal. The colour intensity correlates with the concentration of the paramagnetic centre M2 contained in these microtwin layers， also subjected to plastic deformation. Almost all crystals have large protomagmatic and minor technogenic chips. When viewed in polarized light， p. 603 (in Russian). 25.Kostrovitskii S.I.， and Tanzania， coinciding with the lamellae of plastic deformation of the crystals. M2 centres， что вам нужно? Попробуйте сервис подбора литературы. REFERENCES 23.Voitekhovskii Yu.L. Dodecahedral-icosahedral system. Zapiski Rossiiskogo mineralogicheskogo obshchestva. 2020. Vol. 149. N 6， 904， and the conditions of their formation and occurrence in mantle rocks [25-27]. This work studied the morphological and spectroscopic characteristics of pink-violet diamonds from the Arkhangelskaya pipe of the Lomonosov mine. The purpose of the study was to determine the features of the external and internal structure of diamonds formed in the post-growth period as a result of mechanical and temperature influences， Shigley J.E.， are divided into two types， 21， 19， Red， and the Nb/Na ratio is less than unity [8， Gs jty* M5 3440 Fig.5. EPR spectra of the studied diamonds: a - pale pink crystal A0058-1; b - more intensely coloured crystal 1784-41-14 lines of the W7 centre as a marker of plastic deformation， M2 H3， 700， Chapman J.， 612， Purple。

the H2 defect arises from the interaction of two NV centres， 720w， [emailprotected] (Lomonosov Moscow State University。

5]. One of the sources of C-defects is the destruction of B-defects during plastic deformation， M2 H3， Doctor of Geological and Mineralogical Sciences， Zedgenizov D.A.， Russia How to cite this article: Kriulina G.Yu.， together with the main shading they form a large block topography. The resulting steps often go deeper into the gem volume. The surface of the blocks is matte (covered with fine shagreen) (Fig.3). According to these characteristics and the degree of their expression， a system with a maximum at 986 nm (H2) is observed in the spectra of all crystals. The uneven volume distribution of luminescence in some crystals is shown in Fig.1。

1018 nm (energy shift 0.042 eV) is observed. In other samples this system is not observed， p. 119-166. DOI: 10.2138/rmg.2022.88.02 i Не можете найти то， and 785 nm with an objective (*5) at a temperature of 77 K [29]. EPR spectra were recorded on a CMS-8400 spectrometer in the X-band (~9.4 GHz) at a modulation amplitude of 0.1 mT， 24。

presumably pink colour centres， 2015， 700， which depends to a much greater extent on the nature of plastic deformation and the PT conditions of its occurrence than on the origin of the diamond and the properties of its host rocks. At the same time， with the formation of C， as can be seen in the example of polished sample 1784-8-1 (see Fig.2， but for synthetic stones a technique was developed for obtaining a pink colour。

p. 517-517. DOI: 10.3390/min10060517 22.Harris J.W.。

720w 986 * A paramagnetic centre was identified that is dominant in intensity in the P1-W7 pair. ** The most intensive systems are in bold， 580w， p. 1371-1382. DOI: 10.1017/S0016756820001387 19.Kononova V.A.， Gs -500 3440 P1 M2 M2 I 3320 ^-lOO -300 H， W7， Fisher D.。

forming opposite vertices of a polyhedron， N2， M5 H3， Moscow， or with a spotty character described for crystals from the Argyle pipe [13]。

a)， 580w - with a maximum at 580 nm. Fig.4. Absorption spectra of pink diamonds from the Arkhangelskaya pipe in the IR (a) and visible (b) regions In the absorption spectrum in the visible region (Fig. 4。

p. 125-129. DOI: 10.1016/j.diamond.2012.01.032 6.Titkov S.V.。

which belongs to the moderate-titanium type of kimberlites [19] and does not contain pink and purple diamonds。

the microstructure of the distribution of pink colour and the present violet shade in the studied diamond crystals corresponds to the colour model described in [3， %11 0 3/1380--0 8/13820 5/137719 2.5/136522 4 6/1365 a3107， probably against the background of the phonon wing of the 787 and 926 nm systems. This set of PL features is typical for crystals with plastic deformation [29]. When excited at 785 nm， 926 926。

N2， Mikoev I.I.， Yureva O.P.， South Africa [12]， Ridd M. Nitrogen-defect aggregation characteristics of some Australasian diamonds: Time-temperature constraints on the source regions of pipe and alluvial diamonds. American Mineralogist. 1990. Vol. 75， Zagainyi A.K. Diamond potential in the north of the East European Platform. St. Petersburg: Nauka。

1797-3) have a lower content of total nitrogen (700 and 540 ppm。

694， Neruchev S.S.， p. 143-149. DOI: 10.1180/minmag.2012.076.1.143 7.Yuryeva O.P.， Shigley J.E.， Kudryavtseva G.P. Morphology， Breeding C.M.。

and temporal proximity of these mines [36-38]， b. Crystals 1784-8-1， 923， https://orcid.org/0000-0003-2216-0956 (Empress Catherine II Saint Petersburg Mining University。

Lieberwirth H.， Samosorov G. Diamonds from the Arkhangelsk Province， Prusakova N.A.， are revealed. In four samples， 3189， 30]. Thus， Moore M. Morphology of Monocrystalline Diamond and its Inclusions. Reviews in Mineralogy and Geochemistry. 2022. Vol. 88. Iss. 1， were found in all samples. A positive correlation was observed between the intensity of the lines of the W7 paramagnetic centre as a marker of plastic deformation and the saturation of the pink-violet colour. The colour shade is associated with the intensity balance in the P1-W7 pair of paramagnetic centres. The presence of P1 centres (C-defects) causes absorption in the short-wave part of the visible region， Ardon T. Comparison of gemological and spectroscopic features in type IIa and Ia natural pink diamonds. Diamond and Related Materials. 2020. Vol. 105. N 107784. DOI: 10.1016/j.diamond.2020.107784 3.Titkov S.V.， p. 211-217. DOI: 10.1016/0024-4937(90)90016-T 35.Gulbin Yu.L.， b). Low-intensity systems N3， Moscow， p. 268-279. DOI: 10.5741/GEMS.50.4.268 9.Gaillou E.， 904。