turquoise is an opaque, blue-to-green mineral that is a hydrated phosphate of copper and aluminum. turquoise has a lower-than-ideal hardness and durability for use in certain types of jewelry.
ruby is a pink to blood-red coloured gemstone, a variety of the mineral corundum . ruby is one of the traditional cardinal gems, together with amethyst, sapphire, emerald, and diamond.
peridot is gem-quality olivine and a silicate mineral. its green color is affiliate on the iron contents within the structure of the gem. the molecular structure of peridot consist of isomorphic olivine, silicate, magnesium and iron in an orthorhombic crystal system.
