The Black Diamond Jewelry line was a 1956 Sarah Coventry design. The brooch features brushed silver-tone petals with a large, prong set, faux black diamond in the center. The loop on the back allows the brooch to be used as a pendant by adding a chain. The brooch measures approximately 1½”  x  1½”. Although the brooch is unmarked, it can be found in the Sarah Coventry catalog. This beautiful brooch is in excellent vintage condition.