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Eight HPHT faceted synthetic diamonds from AOTC Group
Near-Colorless HPHT Synthetic Diamonds from AOTC Group

Presents the gemological and spectroscopic properties of a suite of synthetic diamonds grown by AOTC using high pressure and high temperature.

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Man Sin mining
Hunting for
“Jedi” Spinels in Mogok

Documents a series of visits to Myanmar in search of exceptionally bright pinkish red spinels possessing no dark tones.

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Update on Ammolite Production from Southern Alberta, Canada

There have been a number of changes in Ammolite production from southern Alberta, Canada, since 2001.

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Green Amber
Characterization of “Green Amber” With Infrared and Nuclear Magnetic Resonance Spectroscopy

A peridot-like bright greenish yellow to green gem material called “green amber” has recently appeared in the gem market.

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Liddicoatite Tourmaline from Anjanabonoina, Madagascar

Liddicoatite, a calcium-rich lithium tourmaline, was recognized as a separate mineral species in 1977, and named in honor of Richard T. Liddicoat.

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High-purity gold items
Characterization of Tarnish Spots in Chinese High-Purity Gold Jewelry

Examines the origin and nature of tarnish spots in high-purity gold and how they can be avoided.

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Synthetic or Imitation? An Investigation of the Products of Kyocera Corporation That Show Play-Of-Color

An investigation of the difference between synthetic opal and opal simulant.

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Technological Development in the 1990s: Their Impact on Gemology

In the last decade, technology has improved how we synthesize, process, identify, and otherwise study gem materials.

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Separating Natural and Synthetic Rubies on the Basis of Trace-Element Chemistry

Natural and synthetic gem rubies can be separated on the basis of their trace-element chemistry.

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Gemological Properties of Near-Colorless Synthetic Diamonds

Examination of 51 colorless to near-colorless synthetic diamonds from all known sources of production confirms that they can be distinguished from similar-appearing natural diamonds on the basis of their gemological properties.

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