Currency

Currency is any item accumulated and used to make purchases. Coins are a common medium of exchange that the inhabitants of the New World and the YGGDRASIL players share in common.

New World
In the New World three metals are utilized as the monetary standard and valued in increasing value: Copper, Silver, Gold.

YGGDRASIL
Unlike the New World, players used only one type of metal as currency: Gold. After the Great Tomb of Nazarick's transfer to the New World, Ainz discovered that compared to the gold coins that are used by the inhabitants, YGGDRASIL coins have been transformed into actual gold and are possibly worth twice as a standard gold coin.

Trivia

 * It is unknown if New World coins other than gold can be used in Nazarick's NPC resurrection system. Thus Pandora Actor has been charged in appraising all outside valuables in order to determine their value.


 * It seems that YGGDRASIL's coins went through two conversions in the past. Originally the gold coins had the face of a man sealed upon them, before Valkyrie’s Downfall Event.  Its current form has the profile of a woman, possibly a Valkyrie.
 * Ainz keeps the original coins of Nazarick as a keepsake of his younger days of playing YGGDRASIL.