Colorless, sparkling, in imitation of diamonds. Rhinestone glass made from heating mixture of quartz, red lead, potassium carbonate, borax, white arsenic. A pink or purple variety of pyrope. A clear quartz much used for beads, vases, goblets, and crystal balls. A transparent red corundum valued according to shade of color.
Large rubies are often worth more than fine diamonds of the same size.
Darker rubies come from Thailand. Rubies also occur in Sri Lanka, Afghanistan, and North Carolina. A transparent corundum, or aluminum oxide. Sapphires range from white through blue, violet, yellow, and green to near black. Blue star sapphires with six rays are favorite stones.