Bona Sforza (1493–1557), Queen of Poland
1525 · Sardonyx, with inlaid gold and silver details; mounted in 19th century frame as a pendant in gold, with enamel, pearl and ruby
Overall: 2 13/16 x 1 3/4 in. (7.2 x 4.4 cm);
Visible cameo (confirmed): 31 x 22 mm
The Metropolitan Museum of Art