Spring 2015 G&G Examines Blue Spinel, Chinese Jewellery Design and the Latest in Synthetics
G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.
Two Fancy Dark Grey CVD Synthetic Diamonds
Examination of two CVD synthetic diamonds with an unusual Fancy Dark grey colour.
Diamond, Artificially Irradiated and Coated Brown
Examination of a diamond with a rare and highly sought-after Fancy reddish brown colour revealed that it had been irradiated and coated.
For the first time, GIA's laboratory has examined tanzanite colour-coated with titanium.
CVD Synthetic Diamond with Unusual DiamondView Image
Deep blue fluorescence in a CVD synthetic diamond mimics patterns found in natural specimens.
Fancy Black NPD Synthetic Diamond
Testing reveals the first synthetic nano-polycrystalline diamond (NPD) to be detected by a gem lab.
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.
The first documented UV-reactive chemical treatment to make opal appear tenebrescent.
Assembled “Pearl” Filled with Wire
Microradiography reveals wire fillings within a “pearl” created from two separate specimens.
Black diamond with unusual colour origin
This black diamond's colour was produced by natural radiation stains, an unusual cause of colour.