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SINGAPORE, May 2 (Reuters) Gold dropped on Tuesday as investors booked profits after pushing up the metal to a 25-year high above $661 the previous day. Sentiment remained bullish due to concerns about Iran's nuclear programme and a weak dollar.

-- Spot gold eased to $654.00/655.00 an ounce from $657.60/658.60 late in New York on Monday, when it jumped to another 25-year high of $661.10 on fund buying.

-- N M Rothschild pegged support at $643 an ounce and resistance at $656 an ounce.

-- Silver dipped to $13.70/13.80 from $13.90/14.00 in New York and remained below a 23-year peak of $14.68 hit two weeks ago.

-- Barclays Global Investors' long-anticipated ETF, called iShares Silver Trust, traded on the American Stock Exchange on Friday. Each share under the symbol SLV is worth 10 ounces of silver bullion.

-- Platinum was unchanged at $1,167/1,171 an ounce.

-- Palladium was also unchanged at $379/383 an ounce.

REUTERS CS HT0915