An exceptionally large South Sea bead cultured pearl is examined at GIA’s Mumbai laboratory.

An intriguing metallic inclusion is observed in a faceted garnet.

A newly developed treatment creates a phantom structure in opal visually similar to natural phantom opal.

A look at a 34.59 ct CVD-grown diamond examined at GIA’s Hong Kong laboratory.

An iridescent feather inclusion in natural diamond bears resemblance to Rainbow Mountain in Peru.

Isolated nitrogen confined to the outer surface of a 0.98 ct diamond causes “yellow skin.”

Unusual natural pink diamonds displaying faint yellow color zoning and strong yellow fluorescence are studied in the Carlsbad laboratory.

A feather inclusion with iridescence caused by thin-film interference in diamond resembles an insect wing.

A look at a very rare instance of a six-rayed star in aquamarine.

Various inclusions are observed in a batch of aquamarine samples from Xinjiang, China.

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Reports on a newly discovered treatment process for producing a deep blue color in natural spinel and proposes identification criteria.

Investigates the mineral and chemical compositions and surface morphology characteristics of brown mammoth ivory to identify the origins of its brown color.

A look at a rare volcanic glass from central Oregon with lapidary artist Tom Dodge.

Offers a comprehensive look at a variety of augite from Dong Nai, Vietnam, detailing its formation and gemological characteristics.

Gemstones formed in metamorphic environments offer insights into the earth’s history and the evolution of tectonic activity that led to their formation.

The quality and size of this 4.04 ct CVD-grown diamond ring demonstrate the advancing technology in laboratory-grown diamonds.

After a slow start, the spring 2023 auction season ends with multiple broken records.

研究钻石、彩色宝石及珍珠的权威机构GIA美国宝石研究院最近鉴定了一枚以整颗实验室培育钻石切磨而成的钻戒。

研究钻石、彩色宝石及珍珠的权威机构GIA美国宝石研究院最近鉴定了一枚以整颗实验室培育钻石切磨而成的钻戒。