Delicate openwork marked 10K gold. A small, round, faceted stone, possibly a garnet is held elevated in a "buttercup" setting, with 6 prongs rising out of a scalloped base. Late Victorian design. The long pin stem is attached at the top back. On the pin stem is stamped OB10K, which is the hallmark for Otsby & Barton Jewelry Co, 10K gold. 2 1/8" long