HI, the stone of this ring is a natural, earth mined, black star sapphire, 9x7 mm, oval cabochon, 2.7 carats. The ring is made in 925 sterling silver. 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 4 grams; 9 mm wide. LOVE IT OR RETURN IT.