Synthetic corundum, in the form of synthetic ruby, was the first gemstone reproduced by artificial techniques. Auguste Victor Louis Verneuil invented the flame-fusion technique (now know as the Verneuil method) of melting aluminum oxide and allowing it to recrystallize in a cone-shaped boule, the colour of which can be controlled by the addition of chemical additives.
Synthetic monocrystal corundum
Chemical Composition: Al2O3
Hardness (şMohs): 9
Refractive Index: 1,77
Dispersion (C-F): 0,011
Heat Resistance: up to 1700°C / 3092°F
8.4.2008 23:57:30 | read 15879x