1. Cartier brilliant-cut diamond and platinum three-stone ring, 1980s.
2. Tiffany & Co. marquise-cut diamond and platinum ring, circa 1920.
3. 9.05-carat intense, radiant-cut yellow diamond and platinum ring, circa 1990.
4. David Rosenberg 4.16-carat blue-green, cushion-cut diamond and rose gold ring, 2015.
5. Bulgari 12.21-carat round diamond and platinum ring, circa 1950.