Vaultoro is a wonderful enterprise that adds fungibility to gold by using bitcoin to buy/sell. The gold is stored in Swiss Brinks vaults in your own name completely transparent and audited. The BTC can either be stored in their hot/cold wallets or you can transfer it to your own wallet. They plan to add silver along with LTC and Dash trading options.

https://www.vaultoro.com/?a=116131

The thing about silver is that it is used industrially so it can be subject to supply shortages which will create price spikes. No one knows more about metals than Andy though.