A giant Clamshell ring, 'Yua', a large YUA, with perfect circular centre, decorated with fine and carefully graded nassa shells, woven onto a fibre band. This YUA also has the cut designs on one edge, sometimes interpreted as the hornbill beak. These are used as currency and are very valuable; particularly important in bride price transactions, Prince Alexander mountains, Sepik Region, Papua New Guinea, diameter 21 cm