San Francisco chemist Carroll Chatham, are manufactured by a number of producers and by several different processes. The process used by Gilson, lennix, chathan, inamori and zerfass is the flus fusion method, involving crystallization of the beryl constituents from a melt in some suitable solvent such as lead molybdate. And then stone shows refractive indices birefringence, and SG markedly lower than those for natural emeralds and to have a stronger red appearance.
