News & Articles

A large group of people outside on GIA’s Carlsbad, California  campus.
Guardians of Trust: GIA’s Innovative Research, Instruments and Services

GIA’s services, instruments address new treatments and laboratory-grown gems as they enter the market.

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Pinctada maxima shells
Known Non-Nacreous Non-Bead Cultured Pearls and Similar Unknown Pearls of Likely Cultured Origin from Pinctada maxima

Non-nacreous non-bead cultured pearls from the Pinctada maxima mollusk are characterized and compared with pen pearls in order to aid in origin separation.

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Natural Shell Blisters and Blister Pearls: What’s the Difference?

GIA researchers explore the differences between whole, blister, and shell blister pearls in this study using 33 samples from Pinctada maxima mollusks recovered off Broome, Australia.

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Summer 2019 G&G: Mozambican Ruby, Challenges in Pearl Identification, and an Opal Inclusions Chart

A summary of the Summer 2019 issue of Gems & Gemology.

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Man sits at his desk with a display stand of multiple pieces of jewelry in front of him.
Alum’s Lifelong Quest: Searching for Jewelry Unicorns

Alan Nacht continues a family legacy - Bernard Nacht & Co. – and his quest for unforgettable jewelry.

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The octopus head is a baroque Tahitian cultured pearl and its arms are made of black, yellow and white diamond (in a striped pattern) set in black-plated 18K gold.
A Tropical Paradise of Ocean-Inspired Jewelry and Gemstones

Escape to a warm-water paradise with these jewels and gemstones that evoke the ocean’s essence.

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