Mumbai, April 25 -- Gains in gold prices are seen restricted after the metal hit a lifetime high above $3500 an ounce during the week. Possible de-escalation in US China trade war is weighing on the yellow metal. US Treasury Secretary Scott Bessent said that the ongoing tariff showdown against China is unsustainable, and he expects a "de-escalation" in the trade war between the world's two largest economies in the near future. However, Bessent said the tariffs - 145% on Chinese products and 125% on U.S. products - would have to come down before trade talks can proceed, but said Trump would not make that move unilaterally. Meanwhile, rebound in dollar index from three-year lows is also adding weight on the commodity. Currently, the commodity...