The emerald cut black onyx measures 9 x 7 mm.
- Lifetime Guarantee - 60 Day Worry-Free Return - Black Onyx & Diamond Men's Ring Crafted in Solid 14K Yellow Gold, by SuperJeweler Available in ring sizes 8-12. Beautiful emerald cut black onyx and diamond men's gemstone ring set in 14k yellow gold. Black Onyx & Diamond Men's Ring Crafted in Solid 14K Yellow Gold, by SuperJeweler.