Truegold

Truegold, a branded form of common gold trademarked by the Fendari Mining Consortium, is chemically identical to any other gold found anywhere in the galaxy. So why does it command such a premium? Truegold is surface-treated with a nanotech additive which, at random intervals of anywhere between 10 seconds and and an hour, produces a tell-tale sparkle and "ting!" sound. Truegold's additive can be customized to sparkle on cue (such as at the sudden exposure to light), making it incredibly popular in the dentistry and secret treasure vault industries.