Fall 2016 - Volume 52, Issue 3
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59.88 ct Fancy Vivid yellow irradiated diamond
Very Large Artificially Irradiated Yellow Diamond

Examination of a 59.88 ct irradiated yellow diamond, one of the largest irradiated diamonds identified by GIA.

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4.29 ct color-treated Fancy brown-pink diamond
Treated Pink Type IIa Diamond Colored by Red Luminescence

A type IIa color-treated diamond was graded as Fancy brown-pink under daylight conditions and Fancy purplish gray under incandescent lighting, a color change that resulted from HPHT annealing and irradiation.

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DiamondView image of pink diamond showing two pink spots near the edge of the table facet
Evidence of Focused Beam Irradiation in Treated Pink Diamond

DiamondView imaging and photoluminescence spectroscopy offered evidence of focused beam irradiation in a pink diamond.

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7.11 ct emerald with a large purple inclusion
Unusual Purple Inclusion in Emerald

Microscopic examination of an emerald revealed a purple banded inclusion with the appearance and optic character of fluorite.

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Green sapphire rough treated with a green lead-glass filling
Sapphire Rough Filled with Green Lead Glass

The first sapphire with green lead-glass filling examined at GIA’s Carlsbad laboratory.

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Purple and white non-nacreous pearls
Non-Nacreous Purple and White Pearls Reportedly from Spondylus Species

Examination of pearls with a dominant purple hue, reportedly from the Spondylus calcifer mollusk.

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Black star sapphire enhanced with lead glass
Lead Glass–Filled Black Star Sapphire

The first example of a lead glass–filled black star sapphire examined at GIA’s New York laboratory.

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Fancy red and Fancy Vivid yellowish green color-treated synthetic diamonds
Treated Red and Green HPHT Synthetic Diamonds

Two treated synthetic diamonds, a Fancy red and a Fancy Vivid yellowish green, showed strikingly vibrant colors.

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Melee parcel submitted for screening.
Screening of HPHT Synthetic Melee With Natural Diamonds

A screening service allows the lab to screen for synthetic material in diamond melee parcels.

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