Four atypical bead cultured pearls with variations on two types of nuclei are examined in the Mumbai laboratory.

A rare example of pink pyrope garnet is examined in the Carlsbad laboratory.

Study of phosphorescence produced from visible light suggests future difficulty in accurately assessing bodycolor of HPHT-grown diamonds.

GIA’s Mumbai laboratory encounters a unique example of a shell blister encompassing a gastropod shell.

The Bangkok laboratory identifies the chromophores responsible for the fancy colors observed in treated sapphire from Aappaluttoq, Greenland.

A transparent bright orange sapphire from Greenland stands out at the AGTA show in Tucson.

An overview of the Spring 2023 Gems & Gemology content.

Evaluates the growth mechanisms of special morphological features in Colombian emerald, including possible relationships to trapiche emeralds and samples displaying the gota de aceite effect.

A look at the largest CVD diamond GIA has encountered to date.

GIA is adding a report comment employing the trade color term “Peacock” for designated colors of cultured pearls from the Pinctada margaritifera black-lipped pearl oyster, commonly known as Tahitian pearls.

GIA is adding a report comment employing the trade color term “Peacock” for designated colors of cultured pearls from the Pinctada margaritifera black-lipped pearl oyster, commonly known as Tahitian pearls.

GIA’s industry-leading and globally-recognized diploma and certificate programs educate professionals with the skills needed for success in the gem and jewelry industry.

GIA will return to producing printed GIA Diamond Dossier reports beginning April 9.

GIA will return to producing printed GIA Diamond Dossier reports beginning April 9.

Cloud inclusions resembling stars at night are observed in a faceted diamond.