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An exceptionally large and clean 1.91 ct faceted oval brilliant afghanite.
Large Faceted Afghanite

A report on the largest facet-grade afghanite seen in the GIA gem identification department.

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The repaired diamond.
A Repaired Diamond

A marquise-cut diamond is found to have been broken and reassembled with an unknown adhesive.

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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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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 mollusc.

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

DiamondView is used to differentiate 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 Coloured Stones

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

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Synthetic quartz bangle examined in Bangkok.
Synthetic Rock Crystal Quartz Bangle with Unusual Inclusions

A high-quality bangle with two-phase inclusions, similar to natural quartz is found to be synthetic material.

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Freeform topaz under daylight-equivalent light.
Polished Freeform Topaz Imitating Diamond Rough

Material submitted as a rough diamond is revealed through gemmological testing and analysis to be a near-colourless topaz.

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