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).
Opals Revisited
Long-forgotten opals found after 27 years in storage still looked stable and ready to be worked.
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.
Pressed Gibbsite and Calcite as a Rhodochrosite Imitation
Examines a new rhodochrosite simulant composed of pressed gibbsite and calcite powder.
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.
Unique Vanadium-Rich Emerald from Malipo, China
Spectroscopic and chemical analyses of emeralds from this Chinese deposit show a unique composition.
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.
Characteristics of Hydrothermally Treated Beeswax Amber
Reveals the process for hydrothermal enhancement of amber and the means of detection.
Hydrogen-Rich Green Diamond Color-Treated by Multi-Step Processing
Characterization of an intense yellowish green faceted diamond revealed a complex treatment process.
Natural-Color Fancy White and Fancy Black Diamonds: Where Color and Clarity Converge
A systematic study of the properties of approximately 500 Fancy white and 1,200 Fancy black diamonds.
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
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。
Bullish Predictions for 2019 Holiday Sales Despite Concerns, Sotheby’s Hong Kong Auction Sales
U.S. holiday sales predictions look good. Sotheby’s Hong Kong auction features GIA alumna pieces.
GIA 承諾向人手開採教育項目提供 130 萬美元
CARLSBAD, Calif. – Oct. 16, 2019 – Building on a successful pilot and feedback from small-scale colored gemstone miners in Tanzania, GIA will expand distribution of its innovative gem guide for artisanal miners to other communities and countries in Africa.
GIA Commits $1.3 Million to Artisanal Mining Education Project
CARLSBAD, Calif. – Oct. 16, 2019 – Building on a successful pilot and feedback from small-scale colored gemstone miners in Tanzania, GIA will expand distribution of its innovative gem guide for artisanal miners to other communities and countries in Africa.
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