Zircon , one of the oldest minerals on earth . Don't confuse it with zirconia an imitation of diamond . Very high brilliance , like diamond . It's not so easy to take pictures of this stone because of it's high refraction of light . If you look through the table from above you the double refraction . This gemstone is good for a ring or pendant . Very good bright blue color. weight : 2.05 ct size : 6.8 x 6.8 x 6.2 mm , depth : 5.5 mm light heated .