14-karat gold over .925 sterling silver Gemstone(s): Synthetic Ruby = approximately 1.13 ct. tw. The Ring Size Guide(https://prf.hn/click/camref:1100lvWgf/creativeref:1100l102926/destination:https%3A%2F%2Fs3.amazonaws.com%2Fmore-info%2Fguides%2Fring-size%29 It is customary to treat most gemstones to achieve enhanced color and durability. Some of these treatments may not be permanent, and may require special care. Please note: In product titles ct. tw. refers to the total carat weight of all diamonds and/or gemstones combined. Weighs approximately 3.64 grams