Gemstone Portrait Artist Angie Crabtree
The 2019 AGTA show in Tucson featured the work of a gemstone portrait artist.
Trapiche Emerald from Swat Valley, Pakistan
Minute platy magnetite inclusions in these emeralds from Pakistan could help advance our understanding of trapiche.
Blue Gahnite from Nigeria
LA-ICP-MS analysis helps researchers better understand the composition of this type of spinel from Nigeria.
Mineral Inclusions in Ruby and Sapphire from the Bo Welu Gem Deposit in Chanthaburi, Thailand
Identifies mineral inclusions in corundum from this locality for comparison with other global deposits.
Effects of Mollusk Size on Growth and Color of Cultured Half-Pearls from Phuket, Thailand
Determines methods for maximizing production and quality of cultured half-pearls.
Hydrogen-Rich Green Diamond Color-Treated by Multi-Step Processing
Characterization of an intense yellowish green faceted diamond revealed a complex treatment process.
Gemstones in the Era of the Taj Mahal and the Mughals
A look at the gem ornamentation of this landmark, as well as the jewels of the Mughal dynasty.
Pressed Gibbsite and Calcite as a Rhodochrosite Imitation
Examines a new rhodochrosite simulant composed of pressed gibbsite and calcite powder.
Unique Vanadium-Rich Emerald from Malipo, China
Spectroscopic and chemical analyses of emeralds from this Chinese deposit show a unique composition.
Dendritic Inclusions of Thorianite in Heated Blue Sapphire
Recently, a 2.05 ct blue sapphire was sent to Guild Gem Laboratories for identification.
Artificial Glass Imitating Blue Amber
Artificial glass, a low-cost material, is capable of simulating any gemstone owing to its range of appearances (bodycolor, transparency, and phenomena).
Laboratory-Grown Sapphire with Unusual Features
The Hong Kong laboratory recently examined a 14.36 ct pink-orange cushion mixed-cut specimen.
Resin Imitation Ivory with a Pseudo “Engine-Turned” Structure
Resin materials marketed as imitation ivory were recently acquired by a GIA gemologist.
過去の書籍リスト：メキシコのコルテス海から産出される真珠
Annotated reading lists compiled on Pearls from the Sea of Cortez in Mexico
雖然存有不少疑慮，但根據蘇富比香港拍賣會，2019 年假日銷售預測仍然樂觀
U.S. holiday sales predictions look good. Sotheby’s Hong Kong auction features GIA alumna pieces.
雖然存有不少疑慮，但根據蘇富比香港拍賣會，2019 年假日銷售預測仍然樂觀
U.S. holiday sales predictions look good. Sotheby’s Hong Kong auction features GIA alumna pieces.
ピンクダイヤモンドは何故ピンクなのか?GIA研究員、結晶構造を深く探求する
GIAの研究員が、稀少で美しいピンクダイヤモンドがどのように形成され、その色がどのように生じたかをよりよく理解するために9万以上もの天然ピンクダイヤモンドを分析しました。
懸念に反して、2019年のホリデー商戦の強気な売上高予測。サザビーズ香港オークションの落札結果
米国のホリデー商戦の売上高予測は良好に見えます。サザビーズの香港オークションでは、GIAの卒業生の作品が出品されます。
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