If gentlemen do prefer blondes, it's probably because of Marilyn Monroe...she teamed up with Jane Russell in 1953 in Gentlemen Prefer Blondes. In a publicity shot, Marilyn is wearing a spectacular sapphire ring set in gold.
Product: Topped with a dozen oval man-made sapphires (stones are slightly darker than this photo) with a center of two small clear diamond CZ's. This ring is in a gold over alloy setting.