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Sapphires from Australia

An overview of Australia's recent significance in the production of blue sapphire.

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A bow brooch with long ribbon tendrils.
Article
Bows in Jewelry: The Finishing Touch in Giving

Bows have been a popular motif and finishing touch in jewelry and fashion from time immemorial, recurring and adapting to reflect the style of the era.

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Pinctada maculata pearls and mollusk shell
The Gemological Characteristics of Pipi Pearls Reportedly from Pinctada maculata

Reveals the internal features and spectroscopic data of these small natural pearls and offers the means of separating them from pearls of related mollusk species.

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Victorian Whitby jet
General Gemology and Jewelry

Poster abstracts on “General Gemology and Jewelry” from GIA’s 2018 International Gemological Symposium.

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Sintered zirconia necklace
New Technologies and Techniques

Poster abstracts on “New Technologies and Techniques” from GIA’s 2018 International Gemological Symposium.

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Canary yellow diamond
Diamond Identification

Abstracts of speaker presentations from the “Diamond Identification” session of GIA’s 2018 International Gemological Symposium.

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Single-crystal CVD diamond
New Technologies and Techniques

Abstracts of speaker presentations from the “New Technologies and Techniques” session of GIA’s 2018 International Gemological Symposium.

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An oval shaped bicolor tanzanite has purple on each side with blue-green in the middle.
Article
December Blues: Birthstone Gifts that Will Delight

Looking for a gift for someone special? December’s birthstones offer a treat for every taste, style and personality – even if it’s not their birth month.

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Major colors of HPHT synthetic diamonds
Observations on HPHT-Grown Synthetic Diamonds: A Review

Summarizes statistical data and distinctive features of several thousand gem-quality HPHT synthetic diamonds examined by GIA from 2007 through 2016.

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Emerald crystals from Colombia, Afghanistan, and Zambia
Photoluminescence Spectra of Emeralds from Colombia, Afghanistan, and Zambia

Compares PL spectroscopy data of 48 emerald samples from three countries to evaluate the usefulness of the technique in geographic origin determination.

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