Unique diamond- and emerald-lensed spectacles from the Mughal Empire were tested in GIA’s New York laboratory.

Nacreous pearls are known to have platelet growth resembling fingerprints or topographic maps, but a less common appearance is nacre with a concentric spiral pattern.

The Carlsbad lab received a rhodochrosite cabochon featuring rhomboid-shaped fluid inclusions, causing a four-rayed star.

Contributes to the mining history of Austria’s Habachtal region, which is believed to be one of the earliest emerald deposits.

Remarkable “horsetail” inclusions discovered in a demantoid garnet, while their origin and composition remain under discussion.

The Tokyo lab recently identified a unique localized distribution of cloud-like inclusions in a chrysoberyl.

GIA’s New York laboratory reports a new record size for CVD laboratory-grown diamond.

Reports on the geology, background, and current state of mining and production at Iran’s largest turquoise mine.

A study on heat with pressure treatment of blue sapphires reveals FTIR patterns associated with different iron concentrations.

Fura Gems hosted its first sales event for rough Mozambican rubies in August and September 2021.

This study examines FTIR spectra of yellow sapphire heat treated in an oxidizing atmosphere to deepen its color.

Recently, a 23.67 ct pear cabochon aquamarine with light greenish blue color and poor clarity was sent to the Taiwan Union Lab of Gem Research (TULAB) for identification.

Careful comparison of two GIA reports reveals a fraudulent inscription on a laboratory-produced diamond presented as a natural.

A group of large, high-quality CVD material demonstrates the continued challenge of identifying laboratory-grown gems.

A colorless topaz from Nigeria hosts the only known example of willemite as an inclusion in topaz.

A selection of 74 non-bead cultured and 12 bead cultured pearls grown in cultured pearl sacs and harvested directly from operated mollusks were collected and their internal structures examined using real-time microradiography and X-ray computed microtomography analyses.

Extensive analysis of early beads and pendants from archaeological sites in the French islands of the Lesser Antilles identified the objects as sudoite, which has never before been documented in any lapidary production.

Although spinel is rarely treated, there have been some heated spinels available in the trade.

Distinguished research fellow Dr. James Shigley receives the Robert M. Shipley Award for his contribution to the science of gemology.

A rare transparent and near-colorless sodalite contains two-phase inclusions linking it to its ancient formation.