Art-Deco Black Onyx & Diamond Pin Circa. 1925 American. Measures 2 3/8 inches long, 3/8 inch wide and 1/4 inch deep. 14 old mine cut fine white diamonds with total approximate weight of .40 carats. All diamonds tested with a diamond tester. Onyx tested with refractive index liquid. Pin and setting are 14K rose gold, tested with 14K acid. Has safety clasp. 8.7 gr. 5.6 dwt. Marked SG 14K. In excellent original condition.