In the highlands of Papua New Guinea, boar tusks grown into circles are valuable goods. This growth form is achieved by breaking out the opposite tusks; yet because a boar cannot find food for itself with only two and overly long tusks, the animals have to be hand-fed. Until a tusk has grown into a full circle, it takes about seven years. The difficulties and the duration of the procedure make those deviant tusks highly valuable.
Round boar tusks are usually worn as pendants on necklaces. They are used as gifts at traditional exchange festivals (kula) by some peoples of Papua New Guinea, as bride price and for ceremonial payments.