Ruby is a gemstone of the SUN It is a part of the corundum family and is attractive because of its brilliance if it is crystal clear and transparent. It is found in various crimson and scarlet red colors ranging from pink to a deep ruddy violet color. It has the smooth and delicate luster of classified butter. The finest quality ruby has a delicate rose color, similar to the eye of a living cuckoo. Ruby is a gemstone of the corundum family and is attractive because of its brilliance if it is crystal clear and transparent. It is found in various crimson and scarlet red colors ranging from pink to a deep ruddy violet color. It has the smooth and delicate luster of clarified butter. The finest quality ruby has a delicate rose color, similar to the eye of a living cuckoo.