Here are a few nice raygun pendants found on Etsy. Click the seller's name above each image to go their Etsy shop (and yes, these are all on my wishlist).
Bronze Ray Gun pendant by billyblue22 (this one is my very favourite, and I'll probably get around to buying myself one sooner or later):
Bronze Ray Gun Pendant by dragonstreasure (not as detailed as billyblue22's, but also not as expensive):
Admiral Forsythe's Hand Cannon wooden raygun pendant by buildersstudio (this crafter also makes nice ornaments and full-size rayguns, all of wood):
Hand-drawn, hand-coloured raygun necklace by sacredflesh (much more cheery and fun than the others):
Maybe I should try a raygun in my so-far-experimental project to make jewellery out of my not-to-be-reprinted intaglio plates . . .