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.
agate is a common stone formation, consisting of chalcedony and quartz as its main components, consisting of a wide variety of colors. agates are primarily formed within volcanic and metamorphic stones.