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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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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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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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Beads with submetallic luster.
Chalcedony Beads Coated With Titanium Nitride

Beads in an necklace show a metallic appearance not seen in chalcedony.

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Gem Mountain mining site
Update on Rock Creek Sapphire Deposit

An overview of recently expanded sapphire production at the Gem Mountain mine near Philipsburg, Montana.

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Pieces of broken glass-filled ruby.
Durability of a Broken Glass-Filled Ruby

Heat treatment and glass filler are discovered in a ruby after it is broken during the jewelry setting process.

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