Vintage Sterling Silver cocktail ring with clear and fire opal gemstones

Up for auction today we have a beautiful example of what most would call a cocktail ring. The design appears to be a looped around ribbon. Very attractive! The ring is 925 Sterling Silver with two different color stones, what appears to be Fire Opal and a Clear stone which could be a number of different stones but I'm not certain of the name. The ring is marked 925 SG CHINA. Ring size measures 9 Ring weight is 5.34 grams What does SG 925 China mean when stamped on my jewelry It means that the metal used is of a specific quality. Pure silver is never used, as it is too soft to be practical. All of our silver jewellery is created by Sea Gems Ltd and stamped 925 indicating the quality as "sterling silver" along with the SG hallmark.