Exceptionally Rare Titanoholtite
A stone submitted as dumortierite is identified as rare titanoholtite in the Carlsbad laboratory.
Iridescent Imitation Pearl
A brown oval specimen submitted to the Bangkok laboratory resembles a pen pearl at first glance.
Large CVD-Grown Diamond Resubmitted after HPHT Treatment
A record holder for largest CVD-grown diamond is examined for a second time in the Carlsbad laboratory after HPHT treatment.
Electroformed Gold Bracelet
Examination of gold bracelet bearing a 14K hallmark reveals a wax or resin material under gold plating.
CVD with “Ancient Text” Clouds
A CVD-grown diamond exhibits an interesting clarity characteristic.
Cloud Inclusions Causing Fancy Light Blue Color in Diamond
The New York laboratory reports on the cause of color in a Fancy Light grayish blue diamond.
Dual-Color Double Chatoyancy in Emerald
An emerald displaying dual-color light green and white double chatoyancy is examined in the Tokyo laboratory.
Large Freshwater Cultured Pearls with Atypical Bead Nuclei
GIA’s New York laboratory reports on a submission of two pearl necklaces containing large, intensely colored cultured pearls with unique bead nuclei.
“Lily Pad” Structure in an Orangy Yellow Pearl
An orangy yellow pearl featuring a unique acicular feature is examined at the Mumbai laboratory.
Natural Orange Diamond with Unusual Absorption Features
Two diamonds analyzed in the New York laboratory lead to a newly identified cause of orange color.
Vaterite in Freshwater Natural Shell Blister
A baroque-shaped shell blister is examined at the Mumbai laboratory.
Irradiated and Dyed Akoya Pearls
The New York laboratory reports on a submission of pearls with a combination of irradiation and dye treatments.
Pearls from the Placunidae Family (Windowpane Oysters)
A report on windowpane oyster pearls analyzed in GIA’s laboratories.