Someone has already suggested about Xaut and it has already traded on exchange site and you can also take it as another choice too but if you are interested in digital gold and it's also good crypto backed by gold too and i have talked about where are the reserved gold placed.
As long as that is backed by real good with a very good transparency to the investors and what ever how much you wanna put it to the such token and that will always worth consider it has backed by real commodity.