Strass

Strass Glass with high lead content. The lead increases the refractive index, specific gravity and dispersion but lowers the hardness. Strass was invented in the 18th century by the french goldsmith George Frederic Strass (1701 – 1773).1 Sources Renate Möller....
Synthetic Corundum

Synthetic Corundum

Synthetic Corundum Timeline YearImage 1800The Basic Identity of Ruby and Sapphire was Identified. 1801Robert Hare of Philadelphia Invents Oxyhydrogen ('gas') Blowpipe. 1817Guy-Lussac Found that Heating Ammonium Alum Would Obtain Pure Aluminum Oxide. Synthesizing...
Synthetic Emerald

Synthetic Emerald

Synthetic Emerald Synthetic Emerald Created by the Renowned Chatham Company, est.1938, San Francisco. Further Resources Gems & Gemology: The Quarterly Journal of the Gemological Institute of America. Synthetic Emerald May-June 1935, A coated emerald, p. 254, 1p....