Vintage emerald rivoli brooch

This is an unusual vintage brooch dating to the 1960's. It has an open circular design. There are six individual large crystals. Each basket has a watermelon rivoli rhinestone.Alternating with the baskets is a pave set emerald green small rhinestone. The closure is a safety locking clasp soldered to the frame with a straight pin stem. The frame finish is light gold tone. Size is 1 1/2 inches in diameter with a 3/8 in. This is a rare piece unsigned but in excellent new condition.