Your best bet will be something like Digix, where you have tokenized gold residing in Ethereum's blockchain.
If you can't hold the gold in your hands, you're not the owner!
I've seen bitgold, and something didn't feel quite right about the site to me, would be intersting to hear from people who are using it about their experiences.
Go
here for experiences on bitgold.
Thanks LoyceV. Looks like digix is my main topic to research right now, I want to be very sure what it actually does, interesting read about bitgold. I'll read the whole thread over the weekend. Looks like some interesting reading.