* U.S. gold futures briefly rise above $1,500/oz
* Euro zone debt, U.S. deficit fears keep markets on edge
* Gold/silver ratio drops to lowest since 1983
* Coming up: U.S. existing home sales on Wednesday (Recasts, adds comment, links to graphic, updates prices)
By Frank Tang
NEW YORK, April 19 (Reuters) - Gold futures hit an all-time high above $1,500 an ounce on Tuesday and silver surged on a combination of dollar decline, crude oil gains and worries about sovereign debt problems in Europe.
After being initially pressured by technical selling, bullion rose to a record for a second straight day on market jitters after Standard & Poor's on Monday revised the credit outlook of the United States to negative from stable.
The CBOE gold volatility index <.GVZ>, a gauge of bullion investor anxiety, fell 4 percent after surging to its highest level in four months on Monday. U.S. gold futures activity was quieter than usual as global stock markets steadied following the previous session's equity sell-off.
"It's follow-through buying from yesterday after the market had absorbed an initial bout of profit-taking. The recovery of oil prices and the euro have combined to take gold to the $1,500 level," said James Steel, chief commodity analyst of HSBC.
U.S. gold futures for June delivery <GCM1> settled up $2.20 at $1,495.10 by 2:00 p.m. EDT (1800 GMT), having earlier hit a record $1,500.50 an ounce.
Spot gold <XAU=> gained 0.1 percent to $1,496.69 an ounce, bouncing off a high of $1,499.31. Bullion was set for its fifth consecutive higher session.
Risky assets were hit by a double-whammy on Monday after fears mounted that Greece will have to restructure its debt, maybe as early as this summer, and S&P threatened to cut the United States' AAA credit rating.
Silver <XAG=> also set a 31-year high of $43.92 an ounce, and was later up 1.3 percent at $43.90.
Silver has outperformed gold this year, up more than 40 percent so far against gold's 5 percent rise. The gold/silver ratio slipped to a 28-year low below 35 on Monday.
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Graphic showing gold:silver ratio:
http://r.reuters.com/jyx88r
Graphic showing gold prices in inflation-adjusted terms:
http://r.reuters.com/ren88r
Graphic showing commodity performance:
http://r.reuters.com/duj88r
Graphic showing inflation-adjusted record high:
http://r.reuters.com/ren88r
Graphic showing gold priced in euros:
http://link.reuters.com/xux98r
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CRUDE OIL GAINS, DOLLAR DROPS
Rising crude prices also lifted gold, which is often seen as a hedge against oil-led inflation. Signs that inflation is becoming a major issue in emerging markets, particularly China, has been identified as another support to the precious metal.
Gold remained far below its all-time inflation-adjusted high, estimated at almost $2,500 an ounce, set in 1980, an era of Cold War tension, oil shocks and hyperinflation.
"Most of the trends out there -- worries about the euro, worries about coming inflation, worries about U.S. debt, Chinese buying seeming relatively strong -- suggest the price ought to be going higher," said David Jollie, an analyst at Mitsui Precious Metals.
Bullion also benefited from a stronger euro against the dollar after the euro zone composite PMI private-sector economic indicator nudged up. [
]Dennis Gartman, publisher of the Gartman Letter, said euro-priced gold's <XAUEUR=R> rally toward 1,050 euros, a four-month high, was an important technical indicator. Gartman added he will buy gold in euro terms on any correction toward 1,025 euros.
Among other precious metals, platinum <XPT=> slipped 0.4 percent to $1,766 an ounce, while palladium <XPD=> dropped 1.2 percent to $730.72. Prices at 2:00 p.m. EDT (1800 GMT)
LAST/ NET PCT YTD
CLOSE CHG CHG CHG US gold <GCM1> 1495.10 2.20 0.1% 5.2% US silver <SIK1> 43.913 0.957 0.0% 41.9% US platinum <PLN1> 1771.30 -11.50 -0.6% -0.4% US palladium <PAM1> 731.10 -8.00 -1.1% -9.0% Gold <XAU=> 1496.69 1.61 0.1% 5.4% Silver <XAG=> 43.90 0.58 1.3% 42.3% Platinum <XPT=> 1766.00 -6.65 -0.4% -0.1% Palladium <XPD=> 730.72 -9.21 -1.2% -8.6% Gold Fix <XAUFIX=> 1490.50 -4.50 -0.3% 5.7% Silver Fix <XAGFIX=> 43.22 43.00 1.0% 41.1% Platinum Fix <XPTFIX=> 1780.00 2.00 0.1% 2.8% Palladium Fix <XPDFIX=> 737.00 1.00 0.1% -6.8% (Additional reporting by Jan Harvey in London; Editing by Lisa Shumaker and Sofina Mirza-Reid)