Raman spectroscopy confirmed the identity of the material as pezzottaite by an intense peak at ~1100 cm –1, which is not present in beryl. Fourier-transform infrared spectroscopy showed features ...

“Everyone sells the big three: emeralds, rubies and sapphires. If you want to set yourself apart from your competition, ...

An 11.23 ct purplish pink cabochon exhibiting multiple cat’s-eye phenomena was recently submitted to the Tokyo laboratory for identification (see above, left). Standard gemological testing results ...

The Gemological Institute of America (GIA) recently studied how a natural diamond underwent multiple treatments to achieve its pink color. The GIA received a round, 1.10-carat, ...