Fossil ammonite, Madagascar
This fossil ammonite has been lightly polished, and you can see some flashes of red iridescence! It comes from Majunga, Madagascar and is discreetly and permanently attached to a sterling silver stand.
Ammonites are extinct relatives of modern day nautiloids and squid. The largest known ammonite in the world would have been 8 1/2 feet (2.59 metres) across if it were complete.
1 1/16 inches (2.7 cm) wide, 3/8 inch (0.95 cm) deep and 1 1/16 inches (2.7 cm) tall.