The Wilkinson Diamond Brooch is a 18carat gold brooch featuring 71 fancy-colored diamonds ranging in hue from orange to brown. The colors are natural. The diamonds are marquise, pear and round brilliant cut gems that range in size from 0.3 to 2.5 carats each and have a total weight of 62.30 carats. This brooch was gifted to the Smithsonian Institution National Museum of Natural History in 1977 by Mr. and Mrs. Leonard Wilkinson.