The price of gold posted a surprising decline of 1 percent on Wednesday after the Federal Reserve announced its latest bout of bond buying and analysts have told CNBC that gold's mega-rally is in the balance.

The decline in gold is being seen as unusual as more money printing should be negative for the dollar and positive for gold. Gold prices had hit a two-week high of $1723 on Wednesday before the Fed decision, but on Thursday gold traded around $1695 in the Asian session.