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.
CVD-Grown Synthetic Diamond with Aggregated Nitrogen Impurities
Recently, an unusual 0.94 ct Fancy yellow-brown emerald was submitted to GIA for a synthetic diamond grading report. It contained a cloud of black needle-like inclusions occurring along a plane and showed weak green transmission with fibre-optic illumination.
Orange Diamond with Unusual Colour Origin
GIA recently examined a rare orange diamond that demonstrated the complexity of diamond colour origin.
Turquoise with Fingerprint Pattern
A fingerprint pattern, possibly left by human skin oils during the assembly process, is observed in natural turquoise beads.
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.
Two Fancy Dark Grey CVD Synthetic Diamonds
Examination of two CVD synthetic diamonds with an unusual Fancy Dark grey colour.
Fancy Black NPD Synthetic Diamond
Testing reveals the first synthetic nano-polycrystalline diamond (NPD) to be detected by a gem lab.
The first documented UV-reactive chemical treatment to make opal appear tenebrescent.
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.