Tiffany & Co. 3.82 TCW Platinum-Gold Diamond Broach-PendantQuality, pin with European cut diamonds are as follows: (4) 5 mm round (VS clarity, G color) 1.80 carat; (1) 3.64mm, .17 carat; (30) accenting diamonds, 2.50 mm, 1.80 carat and (5) graduating, 1.50 mm in diameter, .05 carat. The total weight of the diamonds is estimated to be 3.82 carats. Metal is Platinum top of setting and yellow gold, underneath. Pin expands the 1-inch diameter of the pin and the small loop pendant swings upward for use or can be hidden. Vintage, Tiffany & Co. hallmarked with the CO slightly rubbed off, but still seen.GIA Gemologist inspected and evaluated