Combination of Phenomena in Star and Cat’s-Eye Color-Change Sapphire
Both asterism and chatoyancy are observed in a color-change sapphire.
The Type IIb De Beers Cullinan Blue Diamond
GIA’s New York laboratory reports on a 15.10 ct Fancy Vivid blue cut-cornered rectangular step cut named the De Beers Cullinan Blue diamond.
Rare Orange Benitoite
The Carlsbad laboratory reports on a large and exceptionally rare example of bright orange benitoite.
The Grass Is Always Greener…
The Carlsbad laboratory reports on a Fancy grayish green diamond with radiation stains resembling blades of grass.
10 ct HPHT-Treated CVD Laboratory-Grown Diamond
Testing a 10 ct CVD laboratory-grown diamond reveals evidence of HPHT treatment.
Interesting Set of Blue “Rough” Gemstones
Four blue rough gemstones are submitted as natural sapphire, but the Carlsbad laboratory determines only one is natural.
RFID Device Embedded in South Sea Bead Cultured Pearl Necklaces
The Bangkok laboratory reports an increasing number of RFID devices embedded in pearls, including two recently submitted South Sea bead cultured pearl necklaces.
Bicolor Cuprian Tourmaline
The Tokyo laboratory reports on a bicolor copper-bearing tourmaline with bodycolor ranging from bluish green to dark yellowish green.