This is a catalogued piece, designed by William Spratling of Mexico, made by Silson Inc. The brooch measures 3" across. The centre genuine cabochon-cut amethyst with a beautiful deep purple colour measures 27mm (1&1/16") in diameter by 18mm in height. The other amethysts each measure 7mm in diameter (1/4"). They are all in pristine, safe-kept condition, without a single scratch on them. The brooch weighs 73.7 grams, and has been tested as sterling silver (.925 pure). It has a deeply- developed patina, and is stamped "Spratling of Mexico, Silson Inc." Manufactured circa 1950. Pin works flawlessly, overall condition is truly pristine.