For the first time, GIA's laboratory has examined tanzanite color-coated with titanium.
Turquoise with Fingerprint Pattern
A fingerprint pattern, possibly left by human skin oils during the assembly process, is observed in natural turquoise beads.
CVD Synthetic Diamond with Unusual DiamondView Image
Deep blue fluorescence in a CVD synthetic diamond mimics patterns found in natural specimens.
Assembled “Pearl” Filled with Wire
Microradiography reveals wire fillings within a “pearl” created from two separate specimens.
Round CVD Synthetic Diamond Over 1 Ct Identified in Hong Kong Lab
Advances in CVD growth technology have resulted in crystals that yield well-proportioned round brilliant cuts.
Diamond with High Concentration of Nickel
Analysis of Fancy Light greenish yellow diamond leads to detection of nickel, as well as an inclusion that gives a color-change effect.
Green Diamond Treated with Radioactive Salt
The stone owes all of its green color to these shallow radiation stains.
Two Fancy Dark Gray CVD Synthetic Diamonds
Examination of two CVD synthetic diamonds with an unusual Fancy Dark gray color.
Spring 2015 G&G Examines Blue Spinel, Chinese Jewelry Design and the Latest in Synthetics
G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.
Diamond, Artificially Irradiated and Coated Brown
Examination of a diamond with a rare and highly sought-after Fancy reddish brown color revealed that it had been irradiated and coated.