I changed the white gold clasp to a gold clasp on a pearl necklace of mine. The clasp is 5/8". The pearl is 5mm and has a deep luster. Weighs 5.0 grams. Marked 14K on the tongue part of the clasp. This clasp is for a single strand of pearls. Excellent vintage condition. The necklace was a graduation gift when I graduated from college, which was a vintage time ago and was replaced in the 1970s.