Tiffany Setting 1 carat diamond ring 925 sterling silver + 1CT diamond ring Package: it comes with Tiffany & Co. giftbag, boxes, papers,certificate,etc Tiffany. Silver. Copyright-protected design. Description: 1 "is 1 inch = 2.54CM/2.54 cm Ring Size: US 4 -US 13 complete What ring size do you want? ***How to determine your ring size: (1)Wrap a piece of string or a strip of paper tightly around your finger. (2)Mark the point where the two ends meet. (3)Measure the string or paper against a ruler to get the circumference of your finger. (4)Divide that by 3.14 to get the diameter of your finger. (5)Look up your ring size refer to the picture of ring size .