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
Chimú culture obtain, the "Spondylus princeps", known as the “thorny oyster” for its characteristic spines, is a solid red color and can only be harvested by experienced divers. Thus, this shell is more highly desired and traded by the Chimú people. "Spondylus" shell had a wide variety of uses in Andean culture and took a variety of forms, ranging from whole shells to fragments to ground shell powder. This material was worked to create intricately carved ornaments, tools, and goods reserved for the nobles and deities. Shell fragments have been found as inlays for body ornaments and as beads for pieces of