The Bangkok laboratory recently identified a pyrope-almandine garnet in a sapphire host.

Reviews the mining history, market impact, and properties of ruby from northern Mozambique near Montepuez, now the world’s most productive source.

Shows how the color of Madagascar sapphire is lightened with heating to relatively low temperatures below 1350°C.

Two pearls presented a unique challenge, as testing at three different gemological laboratories could not conclusively identify them as natural or cultured, determine a freshwater or saltwater growth environment, or specify the producing mollusk.

Examines the basic characteristics of kimberlites and their relationship with diamonds.

Provides a visual guide to the internal features of natural, treated, synthetic, and imitation opal.

Characterizes black nephrite from a deposit in the Guangxi region that appears to be part of a large-scale jade formation belt in southern China.

A study of these pearls to characterize their distinctive flame structure and examine the possibility of rotation during their formation or growth.

Twelve pink sapphires undergo low-temperature heat treatment and reveal a correlation with the 3232 cm-1 FTIR peak.

GIA had the unique opportunity to study the gemological and chemical characteristics of 854 natural freshwater pearls from the Mississippi River system.

Three incomplete trapiche quartz make up this interesting sample.

Jewelry designer Alexandra Mor uses sustainable alternatives for elephant ivory.

An overview of the Fall 2019 Gems & Gemology content.

An overview of the Summer 2019 Gems & Gemology content.

A phantom sapphire crystal within a host sapphire crystal was recently examined at GIA’s Carlsbad laboratory.

Alan Nacht（艾伦·纳希特）继承了家族遗产——Bernard Nacht & Co.，不断寻找令人难忘的珠宝。

让这些在海中形成的珠宝带您进入梦想中的暖水海洋天堂，感受海洋的气息。

让这些在海中形成的珠宝带您进入梦想中的暖水海洋天堂吧！其设计灵感源自海洋生物，能让您感受到海洋的气息。

关于波希米亚红色镁铝榴石柘榴石的加注读物清单

周大福和 GIA 提供安全的数字区块链证书，将钻石的历程和鉴定信息记录在同一个地方。