1960s rhodium plated round unfoiled faux-sapphire center surrounded by small round aurora borealis surrounded by two rings of unfoiled marquise faux-sapphires and round aurora borealis brooch with security clasp. Unmarked. Verified Delizza & Elster. Measures: 2 1/4 inches across. Condition: Very good; small spots of wear to aurora borealis coating only noticeable upon close inspection, minor light wear on back.