http://www.ebay.com/itm/Ancient-Pre-Columbian-Moche-Indian-Necklace-Composed-of-Nacre-Spondyllus-Beads-/231588110100

Thank you!

I found a lot of strands of spiny oyster heishi, too, but when I looked more closely, the less expensive ones looked more like....red-lipped shell beads??