Some of the items are made from copper and you can buy copper flashing at a good hardware store...
What copy of the Necronomicon are you using? Is it Simons?
Your astronomical times are moving rapidly out of date but I really suggest a crash course in silversmithing. Get a Benzomatic torch with an aerator tip, a bag of microcrystalline wax, a box or milk container, an iron ladle or ceramic crucible, some plaster of paris, some silver, some sand paper, a bit of jewelers rouge, a chamois cloth and an asbestos or flame retardant mat. carve yourself from the wax the amulet you desire with 2 elongated cones coming off the piece...place in box, pour in plaster. let plaster set. remove from box, heat set plaster with torch until wax melts out, melt silver with torch in an iron ladle, pour silver into empty plaster mold, cool, shatter plaster, cut off excess silver, sand and buff smooth. viola! OK OK, depending on size and shape and quality you could pay from $5 for quick engraving to upwards of several hundreds for a custom piece....not usually within your budget realm. Careful with the Necronomicon stuff...it can be dicey, even the Seals of Marduk! (IMG:
style_emoticons/default/flame.gif)