Mens 10k Gold and Onyx Diamond Ring. Marked inside 10K and sterling. Beautiful estate find vintage ring. Black onyx centerpiece with diamond and yellow 10k gold cap on top of sterling silver. Some wear from age and use, top onyx excellent, sides show some small fine scratches and tiny dent. Please see pics of this great vintage ring. Size 11.5. Top part of ring measures 1/2" x 3/8".