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.

An overview of the Winter 2025 Gems & Gemology content.

GIA’s Al Gilbertson receives the American Gem Society’s highest honor.

An updated edition of Herbert Tillander’s book is now available.

GIA’s president and CEO Susan Jacques is honored with the Richard T. Liddicoat Award for Distinguished Achievement.

Presents a comprehensive analysis of the gemological, spectroscopic, and trace element characteristics of a set of Shaanxi emerald samples based on standard and advanced gemological methods.

Investigates deposits known for producing multiple gemstone species and the conditions that create their distinct geological settings.

A report on the increase of artificially assembled or altered specimens circulating in Pakistan’s local gem markets.

GIA studies a selection of rough and cut garnet from a new source in northern Vietnam.

Multiple vivid blue lazurite inclusions are observed in a near-colorless scapolite.

A pink oval conch pearl displays firework-like flame patterns.

A pink spinel hosts a richly textured, opaque metallic inclusion.

Armenite is submitted for the first time to the Carlsbad laboratory.

A precious cat’s-eye boulder opal from Australia is examined in the Carlsbad laboratory.

Examines samples of Mona Lisa turquoise to identify their chemistry and structure, revealing copper as a major elemental component of the material.

Examination of four heart-shaped pearls reveals cavity filling and plugging to improve durability.

A summary of presentations from 24 industry-leading experts at Converge.

A photo tour of the GIA Museum’s latest exhibit featuring extraordinary crystals and gems central to the cultures of southern Asia.