Sterling Silver Oval Turquoise Ring. This gorgeous turquoise ring would make a lovely gift for the special someone. Turquoise is a popular gemstone that has long been prized in many cultures. It's said to bring luck, peace, and protection, and it's also one of the birthstones associated with December. Ring Size: 7 U.S. Weight: 8.4 grams Length: 2 centimeters approx. Width: 1 centimeter approx.