Gemmological instruments

Gemmological instruments Read, P. G. India's mineral wealth Brown, J. Coggin Physical gemmology Walton, James The book most comprehensive in knowledge on precious stones Al-Beruni, Abu Rehan Gemstone enhancement: heat, irradiation, impregnation, Dyeing and... Nassau, Kurt Gemology Hurlbut, Cornelius S. Gemstones of the world Schumann, Walter Gemstones Hall, Cally