Spiral patterns of nacre platelets observed on the surface of a non-bead cultured pearl are reminiscent of fingerprints.

Fibrous mannardite crystals are observed in three colorless quartz samples.

An aquamarine crystal from Pakistan contains a pseudomorphic quartz inclusion.

The blunt termination of a red manganotantalite inclusion displays a striking contrast against a greenish blue sapphire.

A perfectly shaped euhedral tourmaline crystal is identified in a faceted tourmaline.

Microscopic examination reveals intriguing growth tubes in a copper-bearing tourmaline.

Near-colorless heulandite crystals in an Ethiopian opal resemble the segmented bodies of worms.

Although the reign of King Edward VII of Great Britain was relatively short (1902-1910), the age that bears his name produced distinctive jewelry and ushered in several new designs and manufacturing techniques. During this period, women from the uppermost echelons of society wore a profusion of extravagant jewelry as a way of demonstrating their wealth and rank. The almost exclusive use of platinum, the greater use of pearls, and the steady supply of South African diamonds created a combination that will forever characterize Edwardian jewels. The Edwardian age, truly the last era of the ruling classes, ended dramatically with the onset of World War I.

Explore nature’s diamond sculptures—264 rare rough diamonds examined by GIA scientists for their unique shapes and raw brilliance.

Phenomenal gemstones dazzle with unique optical effects like iridescence and play-of-color. Discover how your favorite gem phenomena actually work.

介绍了对产自美国、墨西哥和中国的淡黄色长石进行的热处理和铜漫射试验结果。

Learn about jade's durability and how to care for your jade jewelry.

Edward Gübelin（爱德华·古柏林）博士收集的藏品中，有许多来自世界各地的罕见宝石。

了解人们如此热衷彩钻的原因。

A review of Diamonds: An Early History of the King of Gems by Jack Ogden.

Review of Figures & Faces: The Art of Jewelry by Patrick Mauriès and Évelyne Possémé