This is a hollow gold heart. It does not open and is not a locket. It's yellow gold on one side and rose gold on the other. There are tiny little "x" marks on the heart. On the rose gold side there is a dent on lower right (see photo). Measures 7/8 inch diameter not including the bale and is 1/2 inch deep. Marked 14K. Weight is 2 grams.