Cultured Pearl Market Update
An up-close look at the cultured pearl’s role in the gem and jewelry industry.
Large HPHT-Grown Synthetic Diamonds Examined in GIA’s Hong Kong Laboratory (英语)
Examination of the largest HPHT synthetic diamonds GIA has examined so far demonstrated significant progress in this growth technology.
Conservation Concerns over Use of Tridacna Shell in Imitation Pearls
The New York lab investigates the use of the shells of Tridacna species as imitation pearls.
Exceptional Red Spinels and Fine Aquamarine
Large and Unusual Gems
Fine Corundum, Demantoid Garnet
Fine Tsavorite and Spinel
Exceptional stones are recirculated and new production is showcased at the AGTA show in Tucson.
HPHT Synthetic Diamond Melee in High-Quality Jewelry Piece (英语)
The New York lab discovers a synthetic melee diamond in a pendant, underscoring the importance of testing for undisclosed synthetics.
Tsavorite Garnet and Mahenge Red Spinel (英语)
A discussion of the current demand for tsavorite and spinel in today’s market.
Dumortierite in Rock Crystal Quartz
Prismatic blue and colorless dumortierite inclusions in rock crystal quartz are examined for the first time in the Carlsbad lab.
Large Natural Quahog Pearl
A purple non-nacreous specimen is revealed to be a natural northern quahog pearl.
Color-Change Garnets from Tanzania
Striking Tanzanian garnets showing color shifting at the Riverpark Inn (Pueblo) show in Tucson.
High-End Colored Gems
Ginger Garnet, “Fancy” Tanzanite
Diamond in Diamond
A Fancy black round brilliant diamond has an inclusion that is revealed to be a natural diamond crystal.
Chrysocolla In Quartz
A gemological examination of chrysocolla in quartz from Tucson’s AGTA show.
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