オークションハウス：強力な市場が主要なダイヤモンドと色石宝石に影響を及ぼす (英語)
A report on how high-profile jewelry auctions have affected the gem and jewelry market.
Enriching a Tradition
We’re placing a remarkable resource—almost 80 years—of groundbreaking gemological knowledge at your fingertips.
Infrared Spectroscopic Study of Filled Moonstone
A study on how infrared spectroscopy provides conclusive evidence of impregnated moonstone.
Gemological Characteristics of Saltwater Cultured Pearls Produced After Xenotransplantation
Rare Double-Trapiche Emerald
At the AGTA show, Equatorian Imports showed this contributor two pieces of emerald with a very rare double-trapiche pattern
Dumortierite-Quartz Rock Presented as Sapphire
The Gem Testing Laboratory of Jaipur, India, received for identification an opaque blue specimen, submitted as sapphire.
Musgravite from Myanmar
Two small, near-colorless stones reportedly from Myanmar were loaned to GIA for examination.
大きいCVD合成ダイヤモンドの未開示の試料 (英語)
In mid-2012, one of the international diamond grading laboratories in Antwerp reported undisclosed CVD synthetic diamonds, causing a stir in the diamond industry.
Green Diamond, Treated with Radioactive Salt
The stone owes all of its green color to these shallow radiation stains.
塊状の窒素不純物を含むCVD成長合成ダイヤモンド (英語)
Recently, an unusual 0.94 ct Fancy yellow-brown emerald cut was submitted to GIA for a synthetic diamond grading report. It contained a cloud of black needle-like inclusions occurring along a plane and showed weak green transmission with fiber-optic illumination.
CVD成長法によって作られた非常に大きい合成ダイヤモンド (英語)
The New York laboratory recently tested a 2.16 ct CVD synthetic from Scio Diamond Technology Corp., the largest specimen GIA has seen so far.
ムンバイの研究室に提出された3つのCVD（化学蒸着）合成ダイヤモンド (英語)
The gemological and spectroscopic characteristics of these type IIa synthetic diamonds suggested that they experienced different growth and/or treatment histories.
Large HPHT-Treated Fancy Pink Diamond
The New York lab encountered another large HPHT-treated diamond that showed stronger pink coloration.
A Comparison of Modern and Fossil Ivories Using Multiple Techniques
This article provides identification criteria to distinguish between modern and fossil (mammoth) elephant ivory.
Une Découverte Exceptionnelle de Béryls Gemmes à Chaves, District de Vila Real, Portugal [An Exceptional Find of Gemmy Beryls at Chaves, District of Vila Real, Portugal]
The numerous pegmatites in Northern Portugal are known as sources of fine mineral specimens for mineral collectors.
Trade Fair & Play Fair, Says Gem Trade
Consumer confidence and globalization has led to increasing public awareness of how the goods are made and where they are sourced.
Multifacets: Style Yourself with Jewelry
Spring 2013 review of Multifacets: Style Yourself with Jewelry