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Colombian Emerald Industry: The New Generation

Luis Gabriel Angarita and Edwin Molina share their experiences and perspective on the Colombian emerald industry.

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Recent production of turquoise from Polk County, Arkansas
Turquoise from Western Arkansas

A report on turquoise from the only known U.S. deposit outside of the Southwest.

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This fancy deep green-blue diamond was treated in a multi-step process.
Irradiated and Annealed Blue Type Ia Diamond

Examination shows that a diamond was subjected to a multi-step process in order to introduce a blue color.

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Brown-orange treated CVD-grown synthetic diamond.
Fancy Deep Brown-Orange CVD Synthetic Diamond

A CVD-grown diamond shows an unexpected treatment-caused color.

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Diamond before and after filling large fractures.
Fracture-Filled Diamond with "Rainbow" Flash Effect

The material used to fill a large fracture in a diamond yields an unexpected iridescence under two different illuminations.

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Small unheated spinel and sapphire exhibited by Madagascar Imports
Unheated and Unusual Colors

Margit Thorndal of Madagascar Imports offers her perspective on the colored stone market.

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Micro-Features of Ruby
Inclusions in Natural, Synthetic, and Treated Ruby

Provides a visual guide to the internal features of natural, synthetic, and treated rubies.

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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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These two opals were represented as natural-color blue and pink opal from Mexico.
Update on Dyed Hydrophane Opal

Opal purportedly from a new deposit is found to be dyed.

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Top: The drilled green briolettes. Bottom: Fluid inclusions, crystals, and two-phase inclusions.
Coated Beryl Imitating Emerald

Coating on a beryl demonstrates the importance of thorough examination of jewelry and gem materials.

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