Chinese Freshwater Pearl Culturing, Overall Market Summary
A review of Chinese freshwater cultured pearl production, with an update on the market for Tahitian, South Sea, and akoya cultured pearls.
Chrysocolla In Quartz
A gemological examination of chrysocolla in quartz from Tucson’s AGTA show.
Color-Change Garnets from Tanzania
Striking Tanzanian garnets showing color shifting at the Riverpark Inn (Pueblo) show in Tucson.
Cultured Pearl Market Update
An up-close look at the cultured pearl’s role in the gem and jewelry industry.
Tsavorite Garnet and Mahenge Red Spinel
A discussion of the current demand for tsavorite and spinel in today’s market.
Analysis of Melee Diamonds Using FTIR Spectroscopy
Artificially Irradiated Color-Change Diamonds
Examination of two chameleon diamonds reveals color enhancement through artificial irradiation.
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.
Diamond in Diamond
A Fancy black round brilliant diamond has an inclusion that is revealed to be a natural diamond crystal.
HPHT Synthetic Diamond Melee in High-Quality Jewelry Piece (英語)
The New York lab discovers a synthetic melee diamond in a pendant, underscoring the importance of testing for undisclosed synthetics.
Large HPHT-Grown Synthetic Diamonds Examined in GIA’s Hong Kong Laboratory (英語)
Examination of the largest HPHT synthetic diamonds GIA has examined so far demonstrated significant progress in this growth technology.
Large Natural Quahog Pearl
A purple non-nacreous specimen is revealed to be a natural northern quahog pearl.
Pink and Reddish Purple Cobaltocalcite
GIA's Bangkok lab investigates the coloration and gemological properties of this striking mineral specimen.
CVD Synthetic Diamond with Unstable Color Centers
The Foldscope and Its Gemological Applications
