This incredibly rare vintage Tiffany & Co. diamond solitaire engagement ring in yellow gold is from the Victorian period.  The center diamond is .69 old European cut diamond, set in a gorgeous prong basket.  The high quality center stone is in full view for maximum radiance.  The prongs are finished in white gold, allowing a seamless view of the stone and the bottom half is finished in yellow gold.  This two-tone Victorian stunner is a rare treasure from 1800s.