Article
Fall 2023 G&G Available Now
Erica Zaidman, November 3, 2023
An overview of the Fall 2023 Gems & Gemology content.
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Yellow Sapphire: Natural, Heat-Treated, Beryllium-Diffused, and Synthetic
John L. Emmett, Ungkhana Atikarnsakul, Jennifer Stone-Sundberg, and Supharart Sangsawong, November 3, 2023
Investigates the various chromophores responsible for color in four types of yellow sapphire.
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Turquoise Planet Earth
Britni LeCroy, November 3, 2023
A sphere of Armenian turquoise with natural brown matrix material mimics planet Earth.
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“Nebula” Inclusion in Ruby Beryllium-Diffused to Heal Fractures
Michaela Damba, November 3, 2023
Fingerprints resulting from a flux-assisted heating process give a purple-red ruby a unique appearance.
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CVD “Etch” Channel
Elina Myagkaya, November 3, 2023
The first report of an etch channel–like structure in a CVD laboratory-grown diamond submitted to GIA.
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Heat Treatment Effects on the Behavior of the 3161 cm–1 Feature in Low-Iron Metamorphic Yellow Sapphire
Ungkhana Atikarnsakul and John L. Emmett, November 10, 2021
This study examines FTIR spectra of yellow sapphire heat treated in an oxidizing atmosphere to deepen its color.
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Separating Glass-Filled Rubies Using the DiamondView
Larry Tai-An Lai, August 9, 2018
The DiamondView instrument is able to identify glass as the filler in a pair of heart-shaped rubies.
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Nickel-Diffused Spinel, Vietnamese Augite, Brown Mammoth Ivory, and More…
Duncan Pay, August 4, 2023
An overview of the Summer 2023 Gems & Gemology content.
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A New Treatment: Creating Phantom Structure in Opal
Le Ngoc Nang and Pham Minh Tien, August 4, 2023
A newly developed treatment creates a phantom structure in opal visually similar to natural phantom opal.
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Characteristics of Treated Rubies from Greenland
Martin Viala, Wim Vertriest, Charuwan Khowpong, and Suwasan Wongchacree, August 4, 2023
An overview of the treatment process of ruby and pink sapphire from Greenland and its effect on inclusion scenes and chemistry.
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