I wouldn't take even only part of a gold investment to bitcoin.
Take some (little) fiat and buy like 100 bitcoins. It will be even more (in % out of total) of the gold you already have.
I agree on cedivads advice, but please keep in mind on what forum you're asking. In my opinion gold is really low risk compared to bitcoin, which has an ever expanding possible profit (or loss).
+1, Bitcoin
is high risk, however, if between Gold, Fiat and Bitcoin I could only choose two, I'd take Gold and Bitcoin any day of the week.