Synthetic alexandrite - Growth methods and their analytical fingerprints

Malsy, Anna-Kathrin; Armbruster, Thomas

doi:10.1127/0935-1221/2012/0024-2181

Cited by 5 publications

(9 citation statements)

References 19 publications

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“…These results are consistent with infrared spectra published for different types of chromium-, vanadium-and iron-bearing synthetic alexandrites, which showed small absorption bands in the same spectral range (Henn, 1992;Schmetzer et al, 1996;Malsy and Armbruster, 2012). The different intensities of infrared absorption bands in natural and synthetic alexandrites have already been mentioned by Stockton and Kane (1988).…”

Section: Infrared Spectroscopysupporting

confidence: 89%

“…comm., 2012). The contents of vanadium and chromium determined by Malsy and Armbruster (2012) for five samples grown by the same technique in Novosibirsk (material originating from Tairus, Bangkok) were in the same range (see Table I).…”

Section: B Amentioning

confidence: 83%

“…Gurov et al (1988Gurov et al ( , 2003, Gulev et al (1990) as well as mentioned the presence of growth striations and described small molybdenum platelets and molybdenum microparticles. Malsy and Armbruster (2012) pictured small cavities of unknown nature.…”

Section: Synthetic Alexandrites Grown By the Hoc Methods In Russiamentioning

confidence: 99%

“…Synthetic alexandrites which had been grown by a method designated as 'horizontally oriented crystallization' (HOC), have been available since the late 1980s (Gurov et al, 1988;Gurov and Kirdyashkin, 2001;Gurov et al, 2003). The method was recently mentioned by Malsy and Armbruster (2012) in a paper describing chemical properties of various types of synthetic alexandrites, but a complete gemmological description of the gem material grown using this technique is not yet available. The present paper tries to fill this gap.…”

Section: Introductionmentioning

confidence: 99%

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Synthetic alexandrites grown by the HOC method in Russia: internal features related to the growth technique and colorimetric investigation

Schmetzer¹,

Bernhardt²,

Balmer³

et al. 2013

Journ of Gemm

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The estimated densities of the H 2 S phase (0.58 to 0.77g/cm 3) in isolated and fracture-bound multiphase inclusions in tanzanite have been used to model equilibrate and the contents will be lost through leakage and/or decrepitation. The internal pressures beyond which 'typical' microscopic inclusions in zoisite will leak (P d) but for larger inclusions (>100 μm) this value will be much lower. Thermophysical 10 μm) inclusions in zoisite would not survive the heating process to temperatures but the largest (c. 100 μm) will decrepitate or leak at even lower temperatures. Alignment of planar groupings of re-equilibrated inclusions will produce zones of investigation (Taylor et al., 2013) that microscopic H 2 S inclusions (c. 20 to 100 μm) not been heat treated.

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Section: Infrared Spectroscopysupporting

confidence: 89%

Section: B Amentioning

confidence: 83%

Section: Synthetic Alexandrites Grown By the Hoc Methods In Russiamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthetic alexandrites grown by the HOC method in Russia: internal features related to the growth technique and colorimetric investigation

Schmetzer¹,

Bernhardt²,

Balmer³

et al. 2013

Journ of Gemm

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“…Distinct V contents were also found in some flux-grown synthetic alexandrite trillings produced in Novosibirsk, USSR, and some fluxgrown single crystals with V>Cr also were reported (Schmetzer et al, 1996). Furthermore, distinct amounts of V have been recorded in some samples of Russian synthetic alexandrite grown from the melt by the Czochralski technique, as well as by the HOC method (horizontally oriented crystallization, a horizontal floating zone technique; see Schmetzer and Bosshart, 2010;Malsy and Armbruster, 2012;Schmetzer et al, 2013a).…”

Section: Introductionmentioning

confidence: 96%

Natural and synthetic vanadium-bearing chrysoberyl

Schmetzer¹,

Krzemnicki²,

Hainschwang³

et al. 2013

Journ of Gemm

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Characterization of chrysoberyl and its gemmological varieties by Raman spectroscopy

Rybnikova

Bačík

Uher

et al. 2023

J Raman Spectroscopy

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Various chrysoberyl varieties (non‐phenomenal chrysoberyl, alexandrite and cymophane) are gemstones of high demand; therefore, they are subjected to numerous substitutions by other materials and synthetic analogues. To address this issue, non‐destructive methods for studying gemstones are highly sought after. Raman spectroscopy is one of the most suitable non‐destructive methods for studying gemstones as it requires no sample preparation and does not leave any price‐reducing signs on the gemstone surface. The research is focused on Raman spectroscopy application on chrysoberyl identification, differentiation between its varieties, inclusion analysis, and detection of synthetic analogues and imitations. The alexandrite variety can be identified by its broad luminescence band that ranges from 640 to 790 nm (15 625–12 658 cm−1). Synthetic alexandrite has sharper and more intensive bands on the luminescence spectrum, especially 690 and 696 nm (14 492–14 367 cm−1). Rutile inclusions can be distinguished by a broad band 580–640 cm−1 in the Raman spectrum. Imitations of chrysoberyl represented by corundum and colour‐changing spessartine was also identified. The orientation of faceted stones can also be determined by specific bands present in the Raman spectrum.

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Synthetic alexandrite - Growth methods and their analytical fingerprints

Cited by 5 publications

References 19 publications

Synthetic alexandrites grown by the HOC method in Russia: internal features related to the growth technique and colorimetric investigation

Synthetic alexandrites grown by the HOC method in Russia: internal features related to the growth technique and colorimetric investigation

Natural and synthetic vanadium-bearing chrysoberyl

Characterization of chrysoberyl and its gemmological varieties by Raman spectroscopy

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