Fiber-optic illumination reveals rectilinear zigzag-patterned films with vibrant colors in a blue sapphire.

Blade-like magnetite inclusions developed from a healed fracture in peridot resemble a dark, rainy afternoon in a lakeside city.

An 8.33 ct rectangular heliodor displays two tourmaline inclusions and a thin band of fluids.

Transparent crystal inclusions and gas bubbles are observed in a garnet-topped doublet.

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

A Guatemalan jade called yongchuliao has gained popularity among Chinese buyers.

An etch channel in the crown facets of a diamond resembles a mace-like weapon.

Zigzag lines are observed only with oblique light in a 55 ct aquamarine.

Trigons and tetragons observed in a chameleon diamond indicate both octahedral and cubic growth.

Explores eclogitic diamonds, which make up a significant portion of the gem diamond market, and what they reveal about Earth’s dynamic processes.

Examines dissolution features of heliodor and green beryl from a Ukrainian pegmatite field and offers criteria to distinguish them from samples found in other localities.

Reports on the geological setting and gemological properties of violet-blue gem cordierite from new deposits located in British Columbia.

An overview of the Fall 2023 Gems & Gemology content.

Investigates the various chromophores responsible for color in four types of yellow sapphire.

Details the colors and optical effects caused by metallic copper inclusions in this gem-quality feldspar.

GIA美国宝石研究院将于2024年推出更新版珠宝工艺师（Graduate Jeweler）文凭课程。

GIA美国宝石研究院将于2024年推出更新版珠宝工艺师（Graduate Jeweler）文凭课程。

宝石学研究、教育和鉴定所服务的先导权威GIA美国宝石研究院，将于10月6日星期五在加州卡尔斯巴德的全球总部主办Powered by GIA招聘会，带来非凡体验并提供就业指导，参加者可深入交流，互相启发，并有机会与行业内知名企业的招聘人员会面，拓阔人脉圈子。

宝石学研究、教育和鉴定所服务的先导权威GIA美国宝石研究院，将于10月6日星期五在加州卡尔斯巴德的全球总部主办Powered by GIA招聘会，带来非凡体验并提供就业指导，参加者可深入交流，互相启发，并有机会与行业内知名企业的招聘人员会面，拓阔人脉圈子。

今天的消费者及政府愈来愈重视已打磨钻石原产国的可靠信息。