Beautiful pendant-necklace, created in America during the Art Deco period, back in the 1930. This piece, is a convertible necklace and a brooch that has been crafted in solid platinum of .900/.999. Diamonds: Mounted in bezels and millegrain settings, with 56 European round cut diamonds, 3.12 carats, white colorless F color, VS-2 clarity. Sapphire: Mount in the center in a bezel setting, with 1 round cabochon cut (6 x 6 x 4.3 mm) of a natural blue sapphire of 1.75 carats. Birthstone: Sapphire for the month of September. Weight: 12.3 Grams, (7.88 Dwt). Size: The chain is 16.5 Inches (41.9 Cm) Measurements: 26 by 26 mm (1.02 x 1.02 Inches). Hallmarks: No marks, tested for platinum .900/.999. Very good conditions. Upon Request, Auction House may provide an appraisal. This will carry an additional cost. Appraisals are made by our in house GIA certified Gemologist.