Minute platy magnetite inclusions in these emeralds from Pakistan could help advance our understanding of trapiche.

Quartz crystals with three-phase fluid inclusions from the Jinkouhe mine in the Sichuan Province of China have been sold for many years at gem and mineral shows such as those held annually in Tucson, Arizona.

LA-ICP-MS analysis helps researchers better understand the composition of this type of spinel from Nigeria.

Reveals the process for hydrothermal enhancement of amber and the means of detection.

The DANAT laboratory recently encountered two natural black color beads cut from an unknown mollusk.

At the GIA Carlsbad laboratory, the authors recently examined a cabochon of “bloodshot” iolite (containing red, eye-visible platelets of hematite) intergrown with a sunstone.

Nigerian aquamarine with exceptionally deep and saturated color also displays unusually strong pleochroism.

A systematic study of the properties of approximately 500 Fancy white and 1,200 Fancy black diamonds.

An intriguing item was sent by KC Bell to GIA’s Carlsbad laboratory for examination.

An edible oyster from the Hab River Delta of Pakistan reveals a natural pearl.

このジュエリーの画像コレクションは、金属加工の技法が宝石やジュエリーのデザインをいかに引き立てるかを紹介しています。

Annotated reading lists compiled on Pearls from the Sea of Cortez in Mexico

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。

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。

U.S. holiday sales predictions look good. Sotheby’s Hong Kong auction features GIA alumna pieces.

U.S. holiday sales predictions look good. Sotheby’s Hong Kong auction features GIA alumna pieces.

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.

イダー＝オーバーシュタインの宝石細工の伝統に関して編集された注釈付きの書籍リスト

米国の消費者信頼感は、経済が不況に陥るのを防ぎました。

美國消費者依然信心十足；沖積礦鑽石追蹤及非法黃金