GIA is a trusted authority known for its rigorous, objective analysis of both natural and cultured pearls. Learn about how ...

This chart focuses primarily on the types of natural inclusions found in tourmaline, as well as the minerals in which tourmaline can be found as an inclusion. Treatments such as enhancement of ...

Diamonds have a long history as a premier gemstone—a natural consequence of their beauty, rarity, and superlative physical properties such as extreme hardness. Diamonds that are mined for use as ...

The Karowe Diamond Mine in Botswana, owned and operated by Lucara Diamond Corp., has gained international recognition for producing large, high-quality type IaB or coexistence of IaB with IIa diamonds ...

Raman spectroscopy confirmed the identity of the material as pezzottaite by an intense peak at ~1100 cm –1, which is not present in beryl. Fourier-transform infrared spectroscopy showed features ...

CARLSBAD, Calif. – November 4, 2024 – The GIA laboratory in Ramat Gan, Israel, will end operations by the end of 2024 due to changes in the global diamond industry that resulted in significant ...

CARLSBAD, Calif. – June 2, 2025 – Beginning later this year, GIA (the Gemological Institute of America) will start using descriptive terms to characterize the quality of laboratory-grown diamonds and ...

Metrology, the science of measurement and its application, plays a critical role in the accuracy of GIA’s research and laboratory services. The metrology team closely monitors the performance of ...

Valentina Fetisova’s improbable path from trained ballerina to painter of gem labradorite has two common denominators: love of art and an unwavering dedication to the tiniest detail. Born in Obninsk, ...

This year in Tucson, exceptionally large, clean, and attractively colored topaz and beryl from the Volodarsk-Volynskii pegmatite field in Ukraine (also known as the Volyn deposit) were very popular at ...

Diamond fluorescence can occur in a wide range of patterns and colors, helping to tell the story of a diamond’s unique growth history. These HPHT laboratory-grown diamonds exhibit strong ...

Sapphire, rough and faceted, from the Rock Creek deposit in Montana has become one of the pillar gems of American origin in the global colored gemstone market. Over the past 10 years, Potentate Mining ...