To craft a Necklace you need a template and the appropriate material. The name of the Necklace depends on the material used and on your level in smithing skill.
|Charon Amulet||+1 Ranged +2 Defense||Looted by monsters or in the Auction House|
Note (lovelily99): Primordial Talismans (crafted from Giant Bone) say "A high quality bone necklace" even though they are made from a medium quality material. Leviathan Talismans are crafted from Dragon Horns so the names and pictures in the table do match :P. And Charon Amulets I'll just assume the table is correct as I just tried crafting one and the combination didn't work. Soon hopefully I'll craft the necklaces that have blank squares on the table and help fill in :D. Hope this cleared up the stuff I saw in the comments :).