Black Tourmaline Dainty Natural Stackable Crystal Ring .925 Sterling Silver Sizes 4-10 #SK6905You are buying One (1) . 925 Sterling Silver ring with double terminated Black Tourmaline Center Stone set in 4 prongs. All fittings and ring are stamped . 925 Sterling Silver. This stone has been lightly shaped and polished to retain the natural texture of the stone. Any variations you might see are not imperfections but part of the stone's natural pattern. Stone size is approximately 9 16" length x 5 8" width. Approx 8 gm total weight. Sizes 4 10,