* Gold benefits as dollar index falls <.DXY>
* India gold imports up from August, down from last year
* SPDR holdings unchanged, long position concern remains
(Updates prices, adds analyst comment)
By Rebekah Curtis
LONDON, Sept 30 (Reuters) - Gold rallied to test the $1,000 an ounce psychological marker on Wednesday, as dollar weakness helped the metal stay on track for its best quarterly performance since early 2008.
However the metal struggled to maintain gains above $1,000 an ounce, with the extent of long positioning still a concern. Analysts said that left prices exposed to sharp losses before a fresh attempt at the March 2008 record high at $1,030.80.
Spot gold <XAU=> stood at $997.30 per troy ounce by 1431 GMT, compared with $990.70 quoted late in New York on Tuesday, as the dollar fell against a basket of major currencies <.DXY>.
U.S. COMEX gold futures for December <GCZ9> rose $3.00 at $997.30 per ounce.
A weaker dollar makes gold and other commodities priced in the U.S. currency cheaper for non-U.S. investors.
"A lot of what we've seen today is tied to the dollar weakening, but gold is still vulnerable," said Calyon metals analyst Robin Bhar, also noting poor physical market activity and flows of scrap gold.
"This suggests we need to come back and explore the downside again," he added.
Bullion has risen some 7.6 percent in the past three months while the dollar has shed more than 4 percent over the same period.
The metal is on track to close its best quarterly performance since the first quarter of last year. Gold prices have gained around 14 percent so far this year, also bolstered by technical momentum and concerns about potential inflation.
Speculative positioning is a concern, however, with record long positions on the U.S. COMEX gold futures market for three consecutive weeks.
INDIA IMPORTS
India's gold imports in September were provisionally around 35-40 tonnes, up from August but down by more than a quarter from 54 tonnes a year ago, the head of the Bombay Bullion Association said. [
]Citigroup metals analyst David Thurtell said higher gold prices were hurting demand from India, the world's biggest consumer of the precious metal.
But the physical market is gathering some support in India as jewellery demand picks up in the run-up to the festive period, analysts said.
The world's largest gold-backed exchange-traded fund, the SPDR Gold Trust <GLD>, said its holdings stood at 1,094.107 tonnes as of Sept. 29, unchanged from the previous business day. <XAUEXT-NYS-TT>
VTB capital said in a note to clients that it expected gold prices to stay fairly close to current levels, with support at $984 -- roughly near the low hit late last week.
Among other precious metals silver <XAG=> traded at $16.25 from $16.11, platinum <XPT=> was at $1,280 from $1,267 and palladium <XPD=> traded at $290.50 from $285.
(Additional reporting by Veronica Brown)
(Editing by Keiron Henderson)