This ring is a size 11 1/2 (USA); It may be resized. Markings: JM, BG (Tested & guaranteed to be Sterling Silver) This ring weighs 13.1 Grams The Stone/Design is Blue #8 Turquoise Spiderweb Natural, industry-standard treatment if any The Stone/Design measures 17.9×16.3 mm The condition of this ring is Estate, Very good, moderate patina This vintage item is circa-1970 Thank you for viewing my item! Favorite the store to get updates when items go on sale!