Diana Ring - Black Onyx $125.00 size SIZE 5 SIZE 5 SIZE 6 SIZE 7 SIZE 8 SIZE 5 SIZE 6 SIZE 7 SIZE 8 Add to Cart A glamorous heirloom inspired ring. This unique setting showcases a square-cut Black Onyx gemstone with two synthetic diamonds. Get out the good dishes: Royalty is here.14 Karat Gold plated Sterling Silver.