
Five-tael (6.65 ounces or 190 grams) gold bars are seen at a jewellery store in Hong Kong in this April 21, 2011 illustration photo.
Wall Street plunged nearly 4 percent and other riskier assets collapsed as skittish investors sought a refuge from other safe havens such as U.S. Treasuries in the first session since S&P's downgrade, sending gold's option volatility to its highest level since May 2010 on bets the metal could rally further.
Gold is poised for its biggest one-day gain in nine months as investors bet that nothing short of further government intervention would stave off deepening woes. The Federal Open Market Committee's meeting on Tuesday may hint whether the U.S. central bank will ease monetary policy further.