Why and how Shipley created GIA and its mission

Understanding the color origin of jadeite and reliably determining treatments have become increasingly important in the trade.

欠陥やスペクトルの特徴のマッピング、色の起源の判定、合成石や処理されたメレーダイヤモンドの鑑別におけるこの技術の有用性を探る。

Explores the fascinating history of natural pearling in Australian waters and examines the properties that might help distinguish these natural pearls from those that are accidentally produced during the culturing process.

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.

A relatively new source of gem-quality turquoise is hosted within slates in Zhushan County of China’s Hubei Province.

This article describes the major gem materials of Vietnam, together with their new finds and recent production.

Natural-color saltwater cultured pearls (SWCPs) from Pinctada maxima were studied using UV-Vis-NIR and PL spectroscopy to better understand the mechanisms of their coloration and to separate them from other SWCPs with similar natural colors.

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.

CVDや伝統的なHPHTダイヤモンド合成法で製造されたものではない、新しい高透明性合成ダイヤモンド材料の予備調査

南アフリカとボツワナの学生は、GIA（米国宝石学会）のジュニア宝石鑑定士プログラムで、宝石学、鉱物学、地質学を学ぶ。

L-Box™は、2つ以上のダイヤモンドの外観比較に使用されます。移動する物体の写真を捕捉するためにカメラが搭載されています。 画像は、高解像度又は3D映画制作のために組み合わせることができます。

The current production of cultured pearls from the black-lipped pearl oyster (Pinctada margaritifera) in the Federated States of Micronesia includes mostly beaded as well as blister and nonbead-cultured pearls in a wide array of colors.

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.

An examination of the gemological and spectroscopic properties of CVD synthetic diamonds from Gemesis Corp.

A survey of recent advances in CVD synthetic diamond quality.

G&Gは、2019年 Edward J. Gübelin 博士最優秀記事賞の受賞者を発表します。

この地域の地質と調査中に観測されたサンプルの説明を含め、この新たに発見された鉱床でのサファイア採掘と取引状況を詳細に説明。