HI, the center stone of this ring is a natural, earth mined peridot, 7 mm, round shape, 1.20 carats, v v s clarity, 4 natural blue sapphires around the center, 4x2 mm, marquis shape, 0.40 cttw, v s clarity, and 2 natural, heated blue topaz, 3x3 mm, princes cut, 0.30 cttw, v v s clarity. The ring is made in .925 sterling silver, 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, please send me a message telling me the size that you need or if you want the ring like is. The weight of the ring is 4.6 grams; 9 mm, wide. LOVE IT OR RETURN IT.