The Art Deco Brooch does not have a metal mark but was tested with platinum acid and a "kee" tester to be solid platinum. It weighs 14.2 grams and measures 2" x 1". It holds 48 rose cut natural diamonds with an approx total weight of 1.44 cts and 13 European cut natural diamonds with an approx total weight of .93 cts. The center diamond is .33 cts. The brooch is in excellent condition, and the diamonds are SI quality.