Art Deco .12 Diamond Onyx Ring in 14k White Gold.  This magical Art Deco ring features a .12 carat diamond and black onyx in 14 karat white gold. The center diamond is near colorless and set in surface prongs inside a lozenge-shaped white gold mounting. A bezel set black onyx with openwork Art Deco engravings decorate the head of the ring. The shoulders of the band feature flower engravings, finished in polished 14 karat white gold.