She said, "It became clear we were dealing with a gorgeous rectangular diamond-set brooch with a central oval-cut diamond at around 1.20ct." "This bright diamond was surrounded by about 1.80 ct of ...

Abstract: Experimental results using a step-frequency tunable D-band gyrotron are reported. The short pulse (~3 ms) gyrotron is equipped with an elliptically brazed chemical vapor deposition (CVD) ...

Established in 1931, the Gemological Institute of America (GIA) is the world’s foremost authority on diamonds, colored stones, and pearls. A public benefit, nonprofit institute, GIA is the leading ...