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Cat's-eye demantoid with well-aligned horsetail inclusions.
Cat's-Eye Demantoid and Brown Andradite with Horsetail Inclusions

The examination of two unusual garnets results in identifications issued for the first time in GIA's colored stone report records.

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Orange pear-shaped pyrope-spessartine-grossular garnet.
Unusual Orange Pyrope-Spessartine-Grossular Garnet

A garnet proves to have a much higher grossular component than initially expected.

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Diamond and fraudulent inscription.
HPHT-Processed Diamond Fraudulently Represented as Untreated

An HPHT-treated round brilliant diamond with an inscription that presents as a GIA report number is found to be inconsistent with the institute's report, previously issued for an untreated diamond.

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Quartzite dyed to resemble ruby-in-zoisite.
Dyed Quartzite Imitation of Ruby-in-Zoisite

Beads appearing to be ruby-in-zoisite are revealed to be dyed quartzite.

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5.19 ct CVD synthetic diamond
CVD Synthetic Diamond Over 5 Carats Identified by GIA

Results from GIA’s recent testing of a 5.19 ct CVD synthetic diamond, the largest it has examined to date.

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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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Fancy black pear-shaped diamond.
Separation of Black Diamond from NPD Synthetic Diamond

DiamondView is used to identify a Fancy black natural diamond from its NPD synthetic counterparts.

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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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Six rare gemstones
Unusual Colored Stones

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

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