Striking modernist set, with great geometric design, consists of a pin and a pair of matching earrings, each with opal & onyx inlay. The pin is made in the form of a circle which is split in half, with a bar across the length of the pin, and connected in the center by a square containing opal and black onyx inlay. The round earrings feature the matching square inlay. They were made by Great Falls Metal Works, and are marked on the back of each piece with their logo, GFMW, and the word sterling. The brooch measures 2.5 inches long by 1.12 inches wide, and the earrings are 1.12 inches in diameter. The earrings are for pierced ears. All three pieces are in wonderful vintage condition, showing only light wear.