Spring 2016 - Volume 52, Issue 1
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Opal slices before and after water immersion
Hydrophane Opal Treatment

An opal rough is immersed in water and treated with oil and Opticon to observe effects on transparency and play-of-color.

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5.03 ct Fancy Deep Blue HPHT Synthetic Diamond
Largest Blue HPHT Synthetic Diamond

Analysis of a 5.03 ct HPHT-grown blue synthetic diamond, the largest ever examined by GIA.

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1.81 ct emerald/emerald doublet
Emerald/Emerald Doublet

An unusual doublet consisting of two sections of natural emerald is examined the Tokyo lab.

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Quench-crackled blue synthetic spinel
Quench-Crackled Blue Synthetic Spinel

A synthetic spinel has undergone quench-cracking treatment, possibly to make it appear as a natural specimen.

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CVD synthetic melee diamond mounted in ring
Ring with a CVD Synthetic Melee Diamond

A round-cut specimen set in a ring is the first mounted CVD synthetic melee diamond identified by GIA.

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Fancy pink brown diamond
Diamond Inclusion with Radiation Halo

A diamond’s inclusion, with a radiation stain shaped like a halo, is found to be monazite.

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Six HPHT yellow melee diamonds
Analysis of Yellow Diamond Melee for Color Treatment and Synthetics

A parcel revealed to contain natural, treated, and synthetic diamonds reinforces the importance of identification.

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Six rare gemstones
Unusual Colored Stones

Six rarely seen gemstones are submitted as a parcel to the Carlsbad lab.

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