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.
Unusual Orange Pyrope-Spessartine-Grossular Garnet
A garnet proves to have a much higher grossular component than initially expected.
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.
Dyed Quartzite Imitation of Ruby-in-Zoisite
Beads appearing to be ruby-in-zoisite are revealed to be dyed quartzite.
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.
Sapphire Rough Filled with Green Lead Glass
The first sapphire with green lead-glass filling examined at GIA’s Carlsbad laboratory.
Non-Nacreous Purple and White Pearls Reportedly from Spondylus Species
Examination of pearls with a dominant purple hue, reportedly from the Spondylus calcifer mollusk.
Separation of Black Diamond from NPD Synthetic Diamond
DiamondView is used to identify a Fancy black natural diamond from its NPD synthetic counterparts.
Largest Blue HPHT Synthetic Diamond
Analysis of a 5.03 ct HPHT-grown blue synthetic diamond, the largest ever examined by GIA.
Unusual Colored Stones
Six rarely seen gemstones are submitted as a parcel to the Carlsbad lab.