Herbert Rosenthal (American, 20th c.) 18k yellow gold diamond bee pin or brooch. With a folding and locking pin closure, etched wings, and a cluster of 19 prong-set round brilliant-cut diamonds along the body of the bee. With a recent appraisal and a velvet-lined case. Rosenthal was at the forefront of the creation of bee pins when insect designs became popular in the 1960s. He became the exclusive designer for bee pins for Tiffany & Co. Length: 21 mm. Weight: 5.9 g. Total weight of diamonds (approx.): .75ct