Summer 2015 - Volume 51, Issue 2
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LPHT-annealed CVD synthetics with their DiamondView images
LPHT-Annealed Pink CVD Synthetic Diamonds

The New York lab examines three pink CVD synthetic diamonds which have received LPHT annealing treatment.

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Large Fluorite Sphere
Fluorite Sphere with Phosphorescent Coating

A sphere with unusual phosphorescence is seen in the Carlsbad laboratory.

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Orange sapphire submitted for identification
Beryllium-Diffused and Lead Glass–Filled Orange Sapphire

A sapphire receiving two distinct forms of treatment is seen at the Carlsbad laboratory.

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Synthetic sapphire seen under daylight equivalent light and in DiamondView.
Phosphorescence of Synthetic Sapphire

A synthetic colorless sapphires is tested to identify the source of its phosphorescence.

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Bead-cultured pearl necklace from China
Strong Pinkish Purple Freshwater Bead-Cultured Pearls

A necklace of Chinese freshwater bead-cultured pearls demonstrates the strides made in culturing techniques.

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Fancy gray-purple type IIb diamond seen in the Carlsbad lab
Rare Type IIb Gray-Purple Diamond

A natural type IIb diamond with rare color and very strong 776.4 nm PL peak is seen at the Carlsbad lab.

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The examined Fancy Intense blue diamond
Intense Blue Diamond with Very High Boron Concentration

A natural Fancy Intense blue diamond submitted to the New York lab shows the highest boron concentration ever reported in a natural specimen.

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Five zircon samples studied for radioactive degradation of crystal structure.
Chemical Analysis of Zircon

Trace-element analysis is used to identify metamictization, treatment, and growth conditions of zircon.

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Six near-colorless HPHT synthetic melee diamonds
Near-Colorless Melee-Sized HPHT Synthetic Diamonds Identified in GIA Laboratory

The Bangkok lab examines near-colorless HPHT synthetic diamonds in melee sizes.

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Assembled baroque bead-cultured pearl
Assembled and Bead-Cultured Pearls

Examination of a baroque cultured pearl reveals a bonding agent, along with a damaged bead and new nacre.

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