Cat Sterling Silver Earrings. Birman Cat Silver Drop Earrings - These sterling silver drop earrings are covered with colorful enamel, containing granules of colored glass to enhance the hues. Each piece is hand-finished, so there may be variations from piece to piece. These measure 1 1/4" long (not including the sterling silver ear wire) and 1/2" at the widest point. American artist Marilyn Grame.