HI, the center stone of this ring is a natural, earth mined, Ethiopian opal, 13x10 mm, oval cabochon, 3.2 carats, color play. The ring has 20 natural, hand set rubies on the sides, 1.25 mm, round shape, 0.20 cttw, v s clarity. The ring is made in 14kt solid white gold. The size of the ring is 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, for a faster service, please send me a message telling me if you want the ring as is or the size that you need. The weight of the ring is 6 grams; 13 mm wide. LOVE IT OR RETURN IT.