Research Article Search Results

A report on the HPHT growth of large, gem-quality colorless synthetic diamonds in China.

Lesser-known gem materials are seen in pieces alongside a collection created as an artistic inheritance for future generations of jewelry fans.

Documents a trip to the renowned opal fields of Lightning Ridge, Koroit, Yowah, and Quilpie.

An inclusion outlined by minute graphite crystals within a diamond create an octahedral shape.

A field expedition from GIA Bangkok explores a new ruby deposit and collects specimens for study.

Two near-colorless rounds, weighing 3.23 and 2.51 ct, were the largest CVD-grown synthetic diamonds GIA has examined.

A rare mineral acquired along the Thai-Myanmar border exhibits the distinctive six-spoke pattern associated with trapiche.

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.

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

The Bangkok lab examines near-colorless HPHT synthetic diamonds in melee sizes.

An overview of recently expanded sapphire production at the Gem Mountain mine near Philipsburg, Montana.