Approximately a week ago I calculated the correlation of GOLD/BTC.

Results:
Last year (29-07-2014 - 28-07-2014): 0,519572846
YTD (01-01-2015 - 28-07-2014): -0,562651161

Quite interesting I have to say. Unfortunately I was not able to produce a correlation chart over time. I would love to see such a graph!