Vintage Opal Diamond Ring 14k White Yellow Gold.  This mid-century cocktail ring features a 7.98 marquise shaped cabochon cut opal and 1.75 carats of accent diamonds that are set in 14 karat white and yellow gold. The stunning opal contains lovely flashes of blue and red which contrast beautifully with the white gold prongs holding the center stone and the diamond halo. This ring is a statement piece that would be lovely to wear at a fancy gala or event.