The Carlsbad laboratory recently had the chance to examine a 4.60 ct cushion-cut zircon with truly unusual color behavior.

Creative faceting highlights an octahedral-shaped cloud inclusion in a 2.01 ct diamond octahedron.

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

The Tokyo lab examined a stunning double cat’s-eye emerald whose chatoyancy was created both by its cut and its inclusions.

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.

Several shells received at the Hong Kong laboratory were identified as fossils replaced by emerald crystals.

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.

A fixed star indicating manufactured asterism helps to identify an imitation star sapphire.

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.

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

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

CARLSBAD, Calif. – Nov. 9, 2021 – The GIA community – more than 3,300 associates around the world and hundreds of thousands of graduates – offers their condolences to the family of industry icon Helene Fortunoff, who passed away earlier this week.

CARLSBAD, Calif. – Sept. 13, 2021 – In mid-August, as reported in the media, police in Surat, India, uncovered a fraudulent scheme involving counterfeit inscriptions linking lower-quality diamonds to GIA diamond grading reports for higher-quality stones.

Using customized, image-based measurement systems to quantify the effect of fluorescence on the color, brightness, and transparency of gem diamonds viewed in both face-up and table-down orientations.

An overview of the Summer 2021 Gems & Gemology content.

Documents Namak Mandi’s transformation from a salt market to one of Pakistan’s primary gem trading centers, with a look at the commercial activities taking place today.