HI, the center stone of this ring is a natural, earth mined, ethiopian opal, 9x7 mm, oval cabochon, 1 carat, color play. the ring has 4 natural tanzanite on the sides, 3 mm, round shape, 0.20 cttw, v v s clarity. it is made in 14kt solid white gold, size 7.75. I offer change the size of the ring to any size from 3 to 13 with no extra charge, so if you buy it, just send me a message with the size that you need or if you want the ring like is. The weight of the ring is 4.3 grams; 9 mm wide. LOVE IT OR RETURN IT.