Gold fell over 1 percent to a one-month low on Friday, its biggest daily drop in more than three months, hit by technical selling and tumbling U.S. equities on economic uncertainty around the world.
Silver and platinum group metals also slid broadly after several U.S. multinational manufacturers led by General Electric CO.
Bullion appeared to find support at its 50-day moving average after it briefly broke below that key technical support. It has now erased all of its gains posted after the Federal Reserve in early September launched a third round of bond-buying known as quantitative easing to stimulate economic growth.
"People who rushed in for QE expecting to get a significant lift are getting out of the market," said Frank McGhee, head precious metals trader of Integrated Brokerage Services LLC.
"The longer we don't make a new high, the more people start getting nervous about where gold is trading," McGhee said.
Gold also notched a near two-percent decline this week, its biggest weekly drop in about 4 months. The metal has so far failed to trade above $1,800 an ounce this year.
Some traders said profit-taking could further pressure gold prices, after hedge funds and money managers raised their gold futures positions to their most bullish in nearly 14 months last week, the U.S. Commodity Futures Trading Commission (CFTC) Commitment of Traders report showed.
Spot gold was down 1.2 percent at $1,720.90 an ounce by 2:38 PM EDT (1838 GMT), after hitting a low of $1,715.79, which marked the cheapest price since September 7.
U.S. COMEX gold futures for December delivery settled down $20.70 an ounce at $1,724, with trading volume about 10 percent below its 30-day average, preliminary Reuters data showed.
Bullion weakened as German Chancellor Angela Merkel raised new hurdles to using the euro zone's rescue fund to battle the region's debt crisis. Gold was already under pressure from disappointing economic data this week including U.S. home resale and a jump in jobless claims, and signs China's economy has slowed.
BULL MARKET IN QUESTION
Gold's trading well below its record high during European debt worries suggests the metal could see further weakness, veteran trader Dennis Gartman told clients in a note.
"Something's amiss in the gold market and its health is growing more and more suspect," Gartman said.
Gold hit an all-time high of $1,920.30 set in September last year.
Spot gold's relative strength index (RSI) fell to below 40 on Friday, down sharply from an overbought level of over 80 in September, indicating some investors might start to look for bargains.
Among other precious metals, silver dropped 2.2 percent to $32.06 an ounce, down over 4 percent for the week for its largest weekly decline in almost four months.
Platinum was down 1.7 percent at $1,611.70 an ounce, while palladium slid 2.7 percent to $621.70 an ounce.