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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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Scene of a retail street.
Chow Tai Fook Expands Blockchain Initiative with GIA

Chow Tai Fook and GIA offer secure digital blockchain reports that document the diamond journey and grading information in one place.

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