James Avery Sterling Silver Beaded Marquise Onyx Ring Size 8James Avery Beaded Marquise Onyx Ring. An air of elegance and luxury accompanies this sterling silver ring, adorned with a marquise enhanced black onyx. Set with an approximate 16 x 8mm navette (marquis) enhanced black onyx cabochon. The item “James Avery Sterling Silver Beaded Marquise.