This Art Deco brooch necklace, dating back to 1925 and crafted in platinum, features a Santa Maria blue rectangular step-cut aquamarine weighing 46.30 carats as its centerpiece. The piece is adorned with Old European Cut diamonds that weigh approximately 7 carats in total. It offers versatility in wear, functioning both as a brooch with a double pin clip back and as a pendant necklace. The measurements of the brooch are 2.38 inches x 1.5 inches while the chain measures at 16 inches in length.