Examination of Burmese peridot with impressive size, color, and clarity reveals a fishbone-shaped inclusion.

A useful way to identify stones that contain no distinguishing inclusions.

A cluster of bladed columbite crystals is identified in colorless topaz.

A sphere of Armenian turquoise with natural brown matrix material mimics planet Earth.

Two pearls representing Indian deities were recently examined in the Mumbai laboratory.

Examination of a brown peridot xenocryst reveals thread-like serpentine inclusions resembling ancient text.

Three types of root amber beads submitted for identification are analyzed in Wuhan, China.

GIAの使命は公共の信頼を確保することです。研究所のリーダーシップには、理事会、幹部スタッフ、世界中のラボとキャンパスのディレクターが含まれます。

7種の各通貨ごとのサービス料金一覧。

カリフォルニア州カールスバッドにあるGIA本部の壮大な新展示「南アジアの寺院と宝物」は、来場者を豊かな寺院の風景に没入させ、そこに展示されている宝石、宝石結晶、ジュエリーは単に魅力的な輝きを放つだけでなく、より高い力への道筋となっています。

A diamond with a previously unseen clarity characteristic is seen in GIA’s Carlsbad lab.

Synthesized gem-quality diamonds from the General Electric Company are analyzed for characteristics that distinguish them from natural stones.

This article reports on a detailed gemological examination of this new synthetic cat's-eye alexandrite.

A find of new gem garnets has been made in contact metamorphic deposits in the Republic of Mali, western Africa.

Observations made at GIA on 858 GE-processed diamonds revealed several interesting features that may be diagnostic of this kind of diamond. Specifically, a significant percentage exhibited a slightly hazy appearance, noticeable internal graining, and other unusual internal features.

A laboratory-grown diamond with multiple growth layers highlights the challenges of discerning the details of diamond synthesis.

A natural diamond contains two inclusions resembling a faceted diamond and a rough diamond.

Aragonite and calcite create a captivating iridescent effect in a Pinnidae shell.

A sample of yellow sphene displays a cloud of soap bubble–like inclusions with interference colors.