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Man stands in front a GIA banner that features gemstones.
Article
The ABCs of Pearls Reveal Fascinating Aspects of Gems from the Deep

“The A-Z of Pearls”, with at least one pearl-related subject for each letter of the alphabet, was presented in Thailand recently.

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This 20.60 ct specimen was purchased by the client as a “natural white pearl.”
Filled Pearl with Surface Features

A pearl, thought to be natural, is revealed to be a bead-cultured specimen with a pre-drilled nucleus.

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Two Tridacna species shells with blister pearls.
Partially Hollow Tridacna Blister Pearls with Shells Attached

Blister pearls attached to shells are seen in both the Bangkok and the New York laboratories.

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Sango pearls and coral bead.
“Sango Pearl” from Japan

A study of a pink Japanese akoya cultured pearl yields information about the material’s colour origin.

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Pink “rosebud” conch pearls.
Natural Conch “Rosebud” Pearls

Unique natural conch pearls are studied in the New York lab.

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Four Pinctada maculata bead-cultured blister pearls
Article
Pinctada maculata (Pipi) Bead-Cultured Blister Pearls Attached to Their Shells

A study on four Pinctada maculata cultured blister pearls originating from Penrhyn Island.

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Pearls with Oyster Shell
Exhibition Review: Lustre: Pearling and Australia

A review of Lustre: Pearling and Australia at the Immigration Museum in Melbourne.

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Terri Ottaway stands behind a table with several very large quartz crystal specimens are lined up on it. Some of them come up to her waist height.
Article
GIA’s Museum Team Creates Magic for New York Campus

Display features award-winning diamonds, huge quartz rock crystals, unusual carved gems and pieces of jewellery that represent multiple eras of design.

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Fall 2016 Gems & Gemology Cover
Article
Autumn 2016 G&G: CVD Synthetic Diamonds Survey, Reversible Colour Change in Blue Zircon

A summary of the content found in the Autumn 2016 issue of Gems & Gemology.

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Pinctada mazatlanica shells.
Spectral Characteristics of Pinctada Mazatlanica and Pinctada Margaritifera Pearl Oyster Species

Examination of shells from on P. mazatlanica proves the similarities between that species and P. margaritifera.

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