* China buys gold to rebalance its reserves
* China may buy more, perhaps directly from the IMF
* SPDR holdings fall
(Adds detail/comment, updates prices)
By Pratima Desai
LONDON, April 24 (Reuters) - Gold surged to a three-week high before easing on Friday, boosted by the prospect of further purchases by China, after the country revealed it had been buying the precious metal since 2003.
Spot gold <XAU=> was at $907.25/908.00 an ounce at 1448 GMT from $902 late in New York on Thursday. Earlier on Friday it hit $912.80, a rise of more than 5 percent this week and the highest since April 2.
China has raised its gold reserves by three-quarters since 2003 to 1,054 tonnes, confirming speculation it had been buying in the market for some years. [
]"The massive accumulation of foreign exchange reserves meant gold as a proportion of total reserves had fallen below 1 percent compared with a norm of about 2 percent," said Michael Lewis, head of commodities research at Deutsche Bank.
"It could be a short term supportive story because they want to get back to where they were with quite a substantial amount of purchasing for their reserves."
China's reserves are now the fifth biggest in the world, with only six countries holding more than 1,000 tonnes.
It needs to buy more and some of its purchases could be in the spot market, but UBS thinks there is another way for the China to quickly boost its gold holdings
"The proposed IMF sales of 403.3 tonnes of gold represents the biggest opportunity for China to buy a large amount of gold in one transaction," it said.
"China could buy gold in the open market and add to its holdings, although it would only be able to do so at a slow and steady rate: any move to buy large amounts of gold would have a large market impact."
But some analysts were wary, and said the Chinese buying was the equivalent of less than 100 tonnes a year.
"It doesn't necessarily mean they'll be buying substantial quantities of metal," one precious metals analyst said.
INVESTORS RETREAT
China's news overshadowed a rise in stock markets. Equity gains in recent weeks have dampened investor enthusiasm for gold, seen in the holdings by the world's largest gold-backed exchange-traded fund, the SPDR Gold Trust <XAUEXT-NYS-TT>.
SPDR's gold holdings fell to 1,104.45 tonnes as of April 23, down 1.53 tonnes or 0.1 percent from the previous day, extending a decline that began last week in the biggest unwinding of positions seen since September. [
]A 44 percent surge in SPDR's holdings since the start of the year had helped underpin gold prices, but the last increase was nearly a month ago.
However, traders say renewed dollar weakness will also help sentiment in the gold and precious metals markets. [
]"It's been drifting back with the dollar still weak," said Simon Weeks, managing director of precious metals at Bank of Nova Scotia. "The ETFs have seen some losses and yet we're higher, so its more speculative."
Silver <XAG=>, tracking gold, rose to $12.93 an ounce, the highest since April 3 and was last bid at $12.77/$12.83, up from $12.74 late in New York on Thursday.
Palladium <XPD=> was $232.50/$235.50 from $230.50 an ounce and platinum <XPT=> at $1,172.50/$1,180.50 from $1,178.50 on Thursday.
Prices of platinum used in autocatalysts have staged a recovery in recent days on talk of buying by car makers, glass makers and investment demand. But expectations are the rally will be limited and prone to reversing.
"The gains are premature, there is no end in sight to the carnage in the auto sector, no amount of incentives are going to significantly increase demand for new cars in this environment," a London-based trader said. (Reporting by Michael Taylor; editing by Sue Thomas)