if you're really curious...
usually, jewelers, mainly goldsmiths, can make custom designs for you, but it will cost you. i don't know how much a "1oz" pendant would cost you, but i assume it's the cost of one ounce of whatever metal (i assume you want gold) of a certain purity/karat weight, and the price of labour.
personally, i stick to buying the music and the occasional shirt. stuff like silver bracelets that say 'southpaw', 'unloveable' or 'morrissey', or something like a 1 oz pendant replica is too flashy for my tastes and would give off the 'hot-topic-fan' look, which is nothing to envy - that is, if you're doing this in hopes to impress someone. hopefully, however, this project of yours is a personal one - lets say, from a desire to own jewelry.
