Research

Recent Findings

Pearls, shells, and jewelry on table

The Lure of American Freshwater Pearls: Revisiting the Latendresse Family

Tao Hsu, Chunhui Zhou, Artitaya Homkrajae, Joyce Wing Yan Ho, Emiko Yazawa, and Pedro Padua , May 18, 2017

John Latendresse is known as the father of American cultured pearls. He was also a great natural pearl collector and left his family a remarkable natural pearl collection. The Latendresse family is well recognized in the American pearl industry and has long supported GIA pearl research. Come with us to revisit this family and their pearl collection.

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CVD overgrowth on natural diamond
Synthetics

A Synthetic Diamond Overgrowth on a Natural Diamond

Kyaw Soe Moe, Paul Johnson, Ulrika D’Haenens-Johansson and Wuyi Wang , May 1, 2017

Analysis of a diamond graded Fancy blue revealed a CVD synthetic overgrowth on natural diamond.

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10.08 ct HPHT synthetic diamond with color equivalent to Fancy Deep blue
Synthetics

Blue HPHT Synthetic Diamond Over 10 Carats

Terry Poon and Wuyi Wang , January 27, 2017

Results from GIA’s recent testing of a 10.08 ct blue HPHT synthetic diamond, the largest HPHT synthetic recorded to date.

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Other Publications

Large, Rare Diamonds Reveal the Inner Workings of Earth’s Mantle

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Double-sided Plate Laser Cut from Alluvial Diamond

Diamond Growth from C–H–N–O Recycled Fluids in the Lithosphere: Evidence from CH4 Micro-inclusions and δ13C–δ15N–N Content in Marange Mixed-habit Diamonds

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Ongoing Research

Cambodian-Thai Ruby

A Study of Rubies from Cambodia and Thailand

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Four Pinctada maculata bead-cultured blister pearls

Pinctada maculata (Pipi) Bead-Cultured Blister Pearls Attached to Their Shells

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Rough and cut sapphires

A Study of Sapphire from Chanthaburi, Thailand and its Gemological Characteristics

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Blue Sapphires

An In-Depth Gemological Study of Blue Sapphires from the Baw Mar Mine (Mogok, Myanmar)

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