Emerald Dealing in Afghanistan
An experienced gem dealer gives an overview of sourcing gem-quality Afghan emeralds.
Fine Gems and Update from Myanmar
A look at top-quality gems and insight into a delegation’s visit to gem mines in Myanmar.
Gem Paintings from Thailand
Paintings created from uncut gem fragments are seen at Tucson’s GJX show.
“Boldly Go” with a Southwest-Inspired Starship Enterprise
An eye-catching replica from a cult TV favorite is found in Tucson.
Ametrine Optical Dishes: Windows into the Effects of Crystal Structure
Optical activity is studied using a polished block of ametrine.
New Designs from Paula Crevoshay
World-renowned jewelry artist Paula Crevoshay displays some of her newest pieces at the Tucson gem shows.
Three Faceted Collector Specimens
Three mineral species, not previously seen in the Carlsbad lab, are examined.
Unusual Dark Orangy Red Cordierite
A cordierite with a color not seen in the GIA lab is examined in New York.
The Role of Silicon in the Color of Gem Corundum
Considers the previously unreported but critical impact of silicon on the coloration of gem-quality sapphire.
受賞に輝いたデザイナーのジュエリー、家族の歴史を蘇らせる
Revere Academy（リビア・アカデミー）主催2016年タヒチ産真珠ジュエリーデザインコンテストで優勝に輝いた、GIAのJDTプログラムの卒業生が、彼女の家族のジュエリーの遺産を蘇らせます。
Pyrope-Spessartine Color-Change Garnet with a High Grossular Component
A color change in rough garnet is observed and plotted in GIA’s Carlsbad lab.
Japanese Jadeite: History, Characteristics, and Comparison with Other Sources
Examines the sources, color, texture, and chemical composition of jadeite from Japanese deposits.
天然ダイヤモンドにオーバーグロースした合成ダイヤモンド
Analysis of a diamond graded Fancy blue revealed a CVD synthetic overgrowth on natural diamond.
タイのチャンタブリー産サファイアおよびその宝石学特徴の研究
バンコクのGIAラボによるレポートは、チャンタブリー県のKhao Ploy Waen地区の採掘者から取得した59個のブルーサファイアの試料に関する研究結果を発表します。
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