Spot gold was up 0.5pc at $1,345.74 per ounce by 0952 GMT. US gold futures rose 0.4pc to $1,348.1 an ounce.
"There is some positioning ahead of the FOMC (Federal Open Market Committee) meeting ... Everyone is waiting to see how dovish Fed's going to be and if there is any sort of signalling of cuts on the way to the interest rates," ING analyst Warren Patterson said.
The US central bank is expected to leave borrowing costs unchanged this time but possibly lay the groundwork for a rate cut later this year.
Expectations of an interest cut have been gradually increasing amid the drawn out US-China trade war, signs of the US economy losing steam and pressure by President Donald Trump to ease policy.
These factors have boosted bullion's appeal, with the metal gaining more than 6pc since touching a 2019, low of $1,265.85 in early May.
"Gold is testing again the key resistance placed at $1,350-1,360," ActivTrades analyst Carlo Alberto De Casa said in a note.
"The recovery seen after the fall to $1,330/$1,335 of yesterday is witnessing the strength of the bullish movement, as investors continue to bet on a dovish Federal Reserve in the next few months."
Gold, often favoured by investors in times of uncertainty, tends to gain on expectations of lower interest rates.
Also supporting the bullion were some safe-haven bets amid reports of deployment of about 1,000 more US troops to the Middle East, said Afshin Nabavi, senior vice president at MKS SA.
Fears of a confrontation between Iran and the United States have mounted since last Thursday when two oil tankers were attacked, which Washington has blamed on Tehran.
Among other precious metals, silver was up 0.4pc at $14.89 per ounce.
Palladium climbed about 2pc to $1,478.30 per ounce, having hit a high since March 27 at $1,485.55 earlier in the session.
Platinum rose 0.9pc to $799.23 an ounce after falling to its lowest since May 31 at $786 earlier in the session.