Spiny oysters can be a wide variety of colors, from vibrant orange to purple. The spiny oyster shell (Spondylus Princeps) is found in only one area in the Western Hemisphere- off the coast of Baja California. This shell has been found in abundance in archeological excavations of the Anasazi, Mogollon and Hohokam of the desert southwest. It has also been found in the same eastern mound excavations in which turquoise was also found. The versatility and range of colors make oyster shells popular with the Zuni, Navajo and Hopi tribes that skillfully carve and place shells into sterling silver.