A Very Light pink diamond showing a uniform plane of color intersecting with a cone of strain that fit perfectly into a colorless hole is studied at the Carlsbad lab.

Blue octahedral crystal inclusions within heliodor cabochons are found to be gahnite, a zinc-rich end member of the spinel group.

A colorless diamond crystal fragment shows an eye-visible bluish green internal induced radiation stain that developed in a near-surface environment.

An emerald reportedly from Madagascar is cut to show asterism, a rare phenomenon in this material.

The properties of petrified woods originating from various localities in Thailand and Myanmar are examined.

Advancing CVD growth technologies yield intensely colored, high-quality synthetic diamonds, such as the two green-blue synthetic materials seen in the New York lab.

Proposes a model for trapiche emerald formation based on petrographic, spectroscopic, and chemical examination.

A technique for origin identification based on statistical analysis and LA-ICP-MS spectrometry.

Explores the history, geology, and current production of this unique source of large diamonds.

Examines a new source of colorless and near-colorless gem-quality HPHT synthetic diamonds using spectroscopic and gemological analysis.

Review of Treasures from India: Jewels from the Al-Thani Collection by Navina Najat Haidar and Courtney Ann Stewart.

GIAのフィールドジェモロジストと共に、マダガスカル、ケニア、タンザニア、ザンビア、そしてモザンビークの宝石鉱区を訪れましょう。