A 283.74 ct rough tsavorite from Merelani, Tanzania, yields a square cushion-cut gemstone weighing 116.76 ct.

A gem dealer gives back to the mining communities that have supplied gems over the course of his career.

At the AGTA show, Rod Griffin (Rod Griffin Boulder Opals, Silverado, California, and Queensland, Australia) told us that the world market for all types of opals continues to be strong, but Australia’s opal industry is shrinking due to the costs, challenges, and changing regulations of mining.

Eye-catching stones at Jeffrey Bilgore’s AGTA booth.

A summary of “The Ethics of Jewelry” panel, held at New York’s Metropolitan Museum of Art on January 25, 2019.

A graduate of GIA’s Jewelry Design program in Taiwan is the recipient of the Buccellati Award.

Investigates trace-element chemistry of freshwater natural pearls from North America and China with LA-ICP-MS and uses LDA to identify their origins.

Cat’s-eye nephrite jade from Washington State. Washington Jade (Edmonds, Washington) made its Tucson debut at the AGTA show with nephrite jade from Washington State.

Bangles resembling nephrite and jadeite were not what they appeared to be.

In recent years, the colored stone world has seen a growing appetite for unusual colors.

An update on activity at the Coscuez emerald source, as well as ruby deposits in Mozambique.

Annotated reading lists compiled on Emeralds from Colombia

Researchers from GIA’s Bangkok laboratory seek to identify low-temperature heat treatment in basalt-related blue sapphires.

ダイヤモンドに閉じ込められた鉱物インクルージョンが大陸の構造を解明し、ダイヤモンドが形成された年代をGIAの研究員が判断する際の手がかりとなります。

デビアスは変動に対応し、Federal Trade Commission（連邦取引委員会）はラボで製造されたダイヤモンドに関する警告を発行します。また、302.37カラットのGraff Lesedi La Rona（ザ グラフ レセディ ラ ロナ）の詳細が発表されます。

この天然に鮮やかなブルーサファイアの採鉱および目立つ特徴を報告します。

ロシアのウラル山脈から産出されるプラチナに関する注釈付き書籍のリスト

CARLSBAD, Calif. – March 28, 2019 – On April 30, GIA will introduce the GIA Diamond Origin Report service which will confirm the country of origin of polished diamonds.

ナミビア産の漂砂ダイヤモンドに関して編集された注釈付きの読書リスト。

リバイバルジュエリーは過去からインスピレーションを受けており、私たちの文明の豊かな歴史と私たちを結び付けます。