Vintage Black Onyx Ring A square-cut onyx is set in the center. Hawaiian-style leaf designs are carved on both sides. The inner diameter of the ring is 18.5-19.0mm, which corresponds to sizes 18-20 in Japanese ring sizes. Please use this as a reference. Please note that this is a used item that has been stored indoors for a long time, so we would like to sell it to someone who understands that it is a used item. Thank you. vintage ring ring onyx men's women's Black Onyx Ring, Sterling Silver Black Square Onyx Ring, Mens Ring, Gemstone Ring, Man Silver Engraved Ring, Men Silver Gift, Silver Mens Ring Color: Gold系 (Gold-toned) Ring Size: 19