User:DIAMOND

Gem. A mineral, precious by virtue of its composition, hardnes, and rarity, cut and polished for ornamental use as gemstones, only about 25 are in common use in jewellery; of these the diamond, emerald, ruby and sapphire are classified as precious, and the topaz, amethyst, opal, aquamarine, etc., as semi-precious. Among synthetic precious stones to have been produced successfully one scale, are rubies and sapphires ( first produced by the Frenchman Verneuli in 1904 and 1909 respectiveely), emeralds (first made by German scientists 1930), and diamonds (first made by G.E.C. in U.S.A. in term is sometimes extended to cover them

worlds largest diamond / cullinan / premier diamond mine / pretoria / diamonds / minerals / miners / crown diamond / original diamond / silica