Rai stones

Rai stones are circular disks carved out of limestone with a large hole in the middle. The size of the stones varies widely; the largest are 3 meters (10 ft) in diameter, 0.5 meters (1.5 ft) thick and weigh 4 metric tons (8,800 lb).

The extrinsic (perceived) value of a specific stone is based not only on its size and craftsmanship but also on the history of the stone. If many people — or no one at all — died when the specific stone was transported, or a famous sailor brought it in, the value of the rai stone increases.

Rai stones were used in social transactions such as marriage, inheritance, political deals, sign of an alliance, ransom of the battle dead or just in exchange for food. Many of them are placed in front of meetinghouses or specific pathways. Actual physical ownership of the stone didn't matter — though the ownership of a particular stone changes, the stone itself is rarely moved. The names of previous owners are passed down to the new one. In one instance, a rai being transported by canoe was accidentally dropped and sank to the sea floor. Although it was never seen again, everyone agreed that the rai must still be there, so it continued to be transacted as genuine currency.^[3] What is important is that ownership of the rai is clear to everyone, not that the rai is physically transferred or even physically accessible to either party in the transfer.