HI, the center stone of this ring is a natural. earth mined, Australian white opal, 8x6 mm, 0.75 carats, color play. The ring has 8 natural diamonds, SI1 clarity, color g-h, 0.08 cttw, hand set. The ring is made in 14kt solid gold, and I have 3 of them, one in white, one in rose, and the one in the pictures in yellow gold. The size of the ring is 7.75. I offer change the size of the ring to any size between 3 to 13 with no extra charge, so if you buy one of this rings all you need to do is send me a message telling me the color of the gold and the size that you need. The weight of the ring is 5.8 grams; 7 mm wide. LOVE IT OR RETURN IT. If you have any questions please let me know.