HI, the stone of this ring is a natural, earth mined smoky quartz, 11x9 mm, emerald shape, 3.5 carats, 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, just 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 4.2 grams; 12 mm wide. LOVE IT OR RETURN IT.