Heart Shaped Garnet 9K Gold Ring Size. The setting has a beautiful design to show off the quality of the gorgeous and deep red garnet gemstone, it has 6 small garnets set into the shoulders. It was fully hallmarked for 9ct gold with "375", anchor for Birmingham, "DK" and date mark "g" . It weighs a substantial 3.4 grams. Size N. It is in excellent condition, under a loupe you can see a few very small nibbles on the garnet where it has been worn.