* Dollar hits 1-1/2 year high vs euro
* Oil slips more than $1/bbl as investors fret over demand
(Recasts, adds comment, changes dateline, pvs SINGAPORE)
By Jan Harvey
LONDON, Oct 21 (Reuters) - Gold slipped more than 2 percent in Europe on Tuesday as the dollar strengthened against the euro, denting the precious metal's appeal as an alternative investment, and oil prices eased.
Strong interest in physical investment products such as coins and bars is supporting prices, however.
Spot gold <XAU=> was quoted at $776.35/778.35 an ounce at 0846 GMT, down from $795.00 an ounce late in New York on Monday.
After several weeks of being buffeted by movements in the equity markets, which have dictated interest in gold as a haven from risk, the precious metal is now returning to its usual two external influences, the dollar and crude oil, say analysts.
"The strength of the dollar is keeping a cap on gold," said Afshin Nabavi, head of trading at MKS Finance in Geneva.
"The OPEC meeting is also coming up this week. If they decide to go ahead and cut production, that should boost the oil market and could help precious metals."
OPEC will meet in Vienna on Friday to discuss changes to its output quotas, but has already suggested it is in favour of a cut to boost oil prices, which have halved from the high of $147.27 a barrel hit in July.
An upturn in the crude market is likely to pull gold in its wake. The precious metal is often bought as a hedge against inflation led by oil and other commodities.
On Tuesday oil prices eased by more than $1 a barrel, however, as investors worried about underlying demand as the economic slowdown got underway. Similar fears are weighing on other commodity prices.
If inflation fears subside, gold prices are likely to ease, analysts said. "A number of participants are envisaging continued weakness due to deflationary pressures," Fairfax analyst John Meyer said in a report.
The dollar has also rebounded to a 1-1/2 year high against the euro, as investors were cheered by Federal Reserve Chairman Ben Bernanke's testimony to Congress on Monday, during which he endorsed more government spending to stimulate the U.S. economy. [
]"The dollar is gaining from perceptions that U.S. authorities are being much more proactive than their European counterparts," said Standard Bank analyst Walter de Wet, whose bank sees the euro at $1.29 in the next three months.
"While we believe the normalisation of money markets should support precious metal prices as liquidity returns, a strong dollar would make large price rallies difficult to sustain," de Wet said.
Physical interest in gold remains supportive, however. The SPDR Gold Trust, the world's largest gold-backed exchange-traded fund, said its holdings remain near record levels, despite a small outflow on Monday. [
]Buying of coins, bars and jewellery is also firm.
"Physical demand is very strong, particularly out of the Far East. For the last couple of days, it has been remarkable," said Nabavai. "This is providing some good support at lower levels."
Among other precious metals, platinum and palladium were little changed as traders took a breather after last week's heavy losses and Monday's recovery.
Spot platinum <XPT=> was trading at $882/902 an ounce against $893 an ounce on Monday, while palladium <XPD=> was at $181/184.50 an ounce against $178.50.
Silver <XAG=> edged up to $9.80/9.88 an ounce from $9.75.
(Reporting by Jan Harvey; editing by Peter Blackburn)