Non-Nacreous Purple and White Pearls Reportedly from Spondylus Species
Examination of pearls with a dominant purple hue, reportedly from the Spondylus calcifer mollusk.
Screening of HPHT Synthetic Melee With Natural Diamonds
A screening service allows the lab to screen for synthetic material in diamond melee parcels.
Unusual Purple Inclusion in Emerald
Microscopic examination of an emerald revealed a purple banded inclusion with the appearance and optic character of fluorite.
Evidence of Focused Beam Irradiation in Treated Pink Diamond
Lead Glass–Filled Black Star Sapphire
The first example of a lead glass–filled black star sapphire examined at GIA’s New York laboratory.
Sapphire Rough Filled with Green Lead Glass
The first sapphire with green lead-glass filling examined at GIA’s Carlsbad laboratory.
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.
Treated Red and Green HPHT Synthetic Diamonds
Very Large Artificially Irradiated Yellow Diamond
Examination of a 59.88 ct irradiated yellow diamond, one of the largest irradiated diamonds identified by GIA.