The Crown of Queen Elizabeth the Queen Mother, manufactured for her coronation as Consort of King George VI, was the first British crown to be made of platinum. Platinum was not recognized as a chemical element until 1735 and was not used as the British hallmark for platinum until 1975. Platinum is known for its silvery grey color that complements diamonds well, giving engagement rings a "wow factor", as can be seen in many antique engagement rings with platinum settings that emphasize gemstones.