This 1960's DeLizza & Elster Juliana line brooch is a curvy , open-top wreath set with marquise rhinestones in peridot green, lime/white/clear givre, and peridot foiled chatons.
The design is 2 1/4" wide by 2" high. The marquises are open-backed to allow light to transmit to reveal the swirling colors. A safety clasp secures the pin bar. A very similar design can be seen on page 179 of Ann Pitman's "Juliana Jewelry Reference".
There are two small loops of gold metal on the back behind one stone but it is not visible from the front. Condition is fabulous with no scratches, chips, or wear.