Ruby Red Watermelon Smooth Natural Beads NecklaceRuby is a pink to blood red colored gemstone, a variety of the mineral corundum (aluminum oxide). Other varieties of gem quality corundum are called sapphires. Ruby is one of the traditional cardinal gems, together with amethyst, sapphire, emerald, and diamond.[3] The word ruby comes from ruler, Latin for red. The color of a ruby is due to the element chromium. Rubies are thought to energize and balance, stimulate heart chakra and encourage a passion