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。

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

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

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

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

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

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

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

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

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.

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

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

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.

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.

The third Jewelry Industry Summit, held in Tucson February 2–3, revealed the successful implementation of several initiatives mapped out since the conference’s inception in 2016.