Supply Chain Transparency and Beneficiation

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Rex Guo: The Science and Art of Recutting Fine Gemstones

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Opal from West Java, Indonesia

At the AGTA show, Rare Earth Mining Co. (Trumbull, Connecticut) displayed an unexpected material: Indonesian opal reportedly from West Java.

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Michael Dyber’s Innovative Gem Carving

Michael Dyber discusses his approach to gem carving.

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Fortieth Anniversary of the Belmont Mine

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来自 Erica Courtney 的设计

艾丽卡·考特尼数十年来一直为好莱坞明星打造红毯造型。她对色彩的敏锐感知和展现宝石之美的能力显而易见。

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Update on Russian Demantoid Production

Alexey Burlakov shares insights on the current production of Russian demantoid and emeralds.

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Omphacite and Chromite: A "Bimineralic Inclusion" in Diamond

Two inclusions appear joined in a diamond host.

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Cat's-Eye Demantoid and Brown Andradite with Horsetail Inclusions

The examination of two unusual garnets results in identifications issued for the first time in GIA's colored stone report records.

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Very Small Akoya Cultured Pearls

A selection of very small akoya cultured specimens demonstrates the challenges gemologists face when determining pearl origin.

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Update from the Responsible Jewellery Council (英语)

The Responsible Jewellery Council (RJC) has announced plans to include colored stones and silver in the next revision cycle for its Code of Practices, which RJC members are certified against.

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Gianmaria Buccellati Foundation Award for Excellence in Jewelry Design

The first annual Gianmaria Buccellati Foundation Award for Excellence in Jewelry Design was presented to GIA graduate Catherine Zheng.

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Five CVD Synthetic Diamonds Greater Than Three Carats

The GIA lab examines five gem-quality CVD-grown diamonds in sizes that reflect the improving technology of the synthetic gemstone industry.

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Aquamarine from Pakistan

A gemological investigation of the aquamarine that has emerged from northern Pakistan in recent years.

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Outlook on Opals from Mexico and Australia (英语)

Jürgen Schütz discussed the opal sourcing and cutting activities of the German firm Emil Weis.

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Vibrantly Colored Gems

Bill Larson of Pala International reports a very strong AGTA Tucson show.

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Interview with a Kenyan Miner and Dealer

Miriam Kamau, owner of Mimo Gems Traders Ltd. in Nairobi, transformed from an office assistant to a dealer and miner to a representative of her country on the international stage of the colored gemstone trade.

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Type IIa Diamond with Extraordinary Etch Channels

Rare dissolution etch channels are seen in a natural diamond.

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Natural-Color Green Diamonds: A Beautiful Conundrum

Characterizes diamonds with exceptionally rare natural green color, based on GIA’s extensive database of samples.

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HPHT-Processed Diamond Fraudulently Represented as Untreated

An HPHT-treated round brilliant diamond with an inscription that presents as a GIA report number is found to be inconsistent with the institute's report, previously issued for an untreated diamond.

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