THE DEFINITIVE GUIDE TO DIAMOND

The commonest kind of crystalline alumina, α-aluminium oxide, is named corundum. When trace components help it become show up red it is named ruby, but all other colorations drop under the designation sapphire. Corundum includes a trigonal Bravais lattice with a space team of R-3c (selection 167 within the Global Tables).Keep in mind, preserve thi