BTC/XAU has come close to parity 3 times, first in 2013, second in Jan 2017, and third in this ongoing rally towards breaking ATH.
Typically, BTC/XAU has had strong rejection between 0.8-1, depending on the value of BTC on the exchange that you consider.
XAU/USD just painted a reversal on the monthly, which could signal the end of a 4 year downtrend. Unless BTC/USD breaks all time high this month, we may see another strong rejection as we climb closer to parity again.