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Large and Unusual Gems
Fireworks Display in Russian Emerald
15 Carat HPHT Synthetic Diamond
A New Method for Imitating Asterism
Several gems were recently examined that showed stars with an unnatural appearance or an unusual number of rays.
Thirty Years Later: “The Royal Tapestry” Revisited
A “Cobalt Blue” Gahnospinel
Phenomenon Resembling Play-of-Color in Sapphire
A phenomenon resembling play-of-color was seen in a 4.13 ct unheated sapphire recently examined by the author.
“Boldly Go” with a Southwest-Inspired Starship Enterprise
Gemstone Carving in China: Winds of Change
Chinese master carvers have produced some of the world's most sophisticated gemstone carvings.
Color Characteristics of Blue to Yellow Beryl from Multiple Origins
Discusses the features of alkali elements and their influence on the color of blue to yellow beryl.