This Saturday is Birthstone Day for December. That means free museum admission for anyone born in the month of December!
Cathodoluminescence image of a zircon crystal from Jack Hills. Photo: John Valley, University of Wisconsin
December babies, your birthstone is zircon. Forget diamonds: zircons are truly forever. The oldest known minerals in Earth’s crust are zircons from Jack Hills in Australia. They have been dated to 4.4Â billion years old!