The Carlsbad laboratory reports on a Fancy Deep brownish yellowish orange diamond featuring trigons within subsurface etch channels.

A unique combination of two intersecting cat’s-eyes is observed in chrysoberyl at the Tokyo laboratory.

This installment of “Colored Stones Unearthed” covers gemstones that formed in magmatic environments and the insights they offer into the evolution of the earth and the geological processes that shaped our world.

Profiles a groundbreaking gem artist on a quest to bring new concepts, techniques, and products to the industry.

Examines the use of strong fluorescence near 394 nm under 320 nm excitation as a potential means of identifying copper diffusion treatment of feldspar.

Characterizes turquoise treated with an inorganic additive that dramatically improves the luster and color of low- and medium-quality material.

Documents heating experiments conducted on Burmese rubies to find useful indicators of heat treatment at temperatures below 1200°C.

An overview of the Winter 2022 Gems & Gemology content.

An overview of the Winter 2022 Gems & Gemology content.

A bluish green omphacite crystal is discovered in a Fancy brown-pink diamond.

A successful spring season set high expectations for colored diamonds at auction in late 2022.

The Gemological Institute of America (GIA), the leading gemological grading and identification organization, is now offering a lower-cost GIA Laboratory-Grown Diamond Report - Dossier.

The Gemological Institute of America (GIA), the leading gemological grading and identification organization, is now offering a lower-cost GIA Laboratory-Grown Diamond Report - Dossier.

The start of 2023 marks a significant milestone in the digital transformation of the global diamond industry - the launch of the fully digital GIA Diamond Dossier, the most widely available diamond grading report in the world.

A lab in Bangkok shares study on color stability in yellow sapphire.

Crystal inclusions in a natural diamond resemble a unique scene.

GIA, the leader in gemological education, research and science-based gem identification and grading services, is revamping the GIA Graduate Jeweler program in collaboration with master goldsmith and award-winning jewelry designer Alan Revere.

During routine color stability testing of sapphires, GIA experts observed an unusual gain of orange or yellow coloration to a padparadscha-like color or even to pure orange.

100 GIA researchers, leading academics, independent industry experts and GIA Governors and executives met in person and virtually at GIA’s global headquarters in Carlsbad, Calif., November 1-3 for the Institute’s 16th annual research meeting.

At their recent Board meeting at the Institute’s California headquarters, the GIA Board of Governors welcomed two new Governors, new Chair and Vice Chair of the Board, and said goodbye to four departing members.