Research Article Search Results

Jaipur, India, is a leading emerald cutting and trading center for the global gem and jewelry industry. See inside the industry with a GIA field team, and learn the intricacies of a business seldom seen by the public or most members of the industry.

Natural pearls of unusual size and unique appearance are retrieved from the west coast of Mexico and examined in GIA’s New York lab.

Review of Collector’s Guide to Herkimer Diamonds, by Michael R. Walter.

A field expedition from GIA Bangkok explores a new ruby deposit and collects specimens for study.

Two blister pearls attached to a host shell believed to have fossilized during the later Pleistocene period and discovered in southeastern Kenya are studied.

A report from the 34th IGC, held in Vilnius, Lithuania in August 2015.

Microscopic and chemical analysis may provide clues to the original source of Montana’s alluvial sapphires and help distinguish them from sapphires with overlapping properties.

A semi-baroque pearl with an unusual radial feature is submitted to the Bangkok lab for testing.

An inclusion outlined by minute graphite crystals within a diamond create an octahedral shape.

GIA began issuing reports that included a cut grade for round brilliant diamonds in 2006 in an effort to establish standards for cut in the same manner as it has for color and clarity. This grading system is based on research conducted over the prior decade which was chronicled in several articles published in Gems & Gemology.