巴布亞新幾內亞人的珠母貝盾（kina moa） Papua New Guinean Kina Moa

Papua New Guineans wearing kina moa, a small, red-round shield inlaid a mother-of-pearl shell. Many societies in the highlands of New Guinea traditionally used prized mother-of-pearl shells, called kina, in ritual exchange. However, Europeans began large quantities of mother-of-pearl shells from coastal regions when they arrived in the area, causing the inflation of shells. Consequently, shells gradually lost their value and were replaced by European currencies in some societies.