Two Hummingbirds Crystal CarvingRuby is a rare gemstone variety of Corundum, the other famous variety being Sapphire. Corundum by itself is colorless, being made of only aluminum and oxygen, but Ruby is distinguished by its rich red color. This comes from small amounts of chromium replacing some of the aluminum. Amethyst is a variety of quartz which owes its coloration to the presence of iron in the area of its formation. The word Amethyst is derived from ancient Greek meaning