We have no way of truly attaching a hard value to an ounce of gold, and it is not used as a currency. However, faith in the metal itself keeps it valuable – the value of gold is in the minds of those trading it - Bitcoin is valuable because those trading Bitcoin consider it to be valuable.  Both are of limited quantity; both are considered a hedge; both are seen as an anti-fiat currency.

In many ways, Bitcoin seemed to be designed – whether intentionally or not – as a virtual form of gold. ]

I can only find their similiraties but in the eyes of most people, bitcoin and gold are in competition and would be trying to fight each other by increasing their values.