Synthetic Corundum

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 color of which can be controlled by the addition of chemical additives.

Ruby Dark Ruby Medium

 Characteristics:                 Synthetic monocrystal corundum
 Chemical Composition:  Al2O3
 Structure:                            trigonal
 Hardness (ºMohs):           9
 Density:                               3,97
 Refractive Index:                1,77
 Dispersion (C-F):              0,011
 Heat Resistance:              up to 1700°C / 3092°F