Royston Turquoise Ring Size 8 1/2

Sterling silver Royston turquoise (a closed mine) ring size 8 1/2. Measurements are 1 1/4 inches from top to bottom and 11/16 across at the widest point. Stone sits about 1/4 inch high. Triple split ring shank witch is 1/8 inch wide. Stamped on back are"JS" and .925.