Shell money most valued by the Native American tribes of the Pacific Coast from Alaska to northwest California was "Dentalium shell", a species of long narrow marine shelled mollusk, a tusk shell or scaphopod. The tusk shell is naturally open at both ends, and can easily be strung on a thread. This shell money was valued by its length rather than the exact number of shells; the "ligua", the highest denomination in their currency, was a length of about 6 inches. Farther south, in central California and southern California, the shell of the olive snail "Olivella biplicata" was used to make beads
Kiffa beads same, i.e. red-yellow-black (dark brown)-yellow-red-white-blue-white. Often the obverse is decorated as well, and it is believed that different bead making families had their own distinct styles. For their wearers, all these beads held amuletic properties. The colours, shapes and the many different intricate decorative patterns all having specific meanings, most of them forgotten today. Diamond-shaped Kiffa beads were traditionally worn on bracelets, sewn onto strips of leather, and arranged in traditional sets composed of a specific ratio of blue to red to polychromatic specimens. Their patterns are believed to protect and to increase the fertility of their wearers and it