6つの方向に伸びた放射状の模様を特徴とするトラピッチェエメラルドは、最高品質かつ最も素晴らしい結晶のひとつの基準となっています。

The president of Oregon’s Desert Sun Mining and Gems provides the outlook for activity at the Ponderosa sunstone mine.

An update on the activity at Potentate’s Montana deposits.

A unique doublet displaying a yellowish chatoyant sheen is examined by the Tokyo lab.

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

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

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

The Carlsbad lab identifies a color-change Burmese sapphire with a unique chemistry profile.

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

Spinel is often inclusion free but occasionally showcases unusual inclusions.

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

Significant amounts of gem-quality sodalite/hackmanite—some unusually transparent—have been produced.

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

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.

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

Advanced testing helps to identify the largest gahnospinel seen at any GIA laboratory.

Establishes a metamorphic origin for sapphire samples from these deposits, supported by their trace-element composition and inclusion characterization, including the age dating of zircon inclusions.

Shows how alexandrite’s color and color change are affected by cut and the orientation of table facets.

Thoughts from a longtime Tucson exhibitor on responsible practices and the changing market trends.

Susi Smither discusses her sustainable, responsible, and ethically based business practices.