Gold premiums in India jumped this week to their highest in more than a decade, as investors rushed to buy the metal on expectations of an import duty hike in the upcoming budget, while China premiums dipped as international spot gold prices neared the historic $5 000 per ounce mark.Bullion dealers charged a premium of up to $112 per ounce over official domestic gold prices – inclusive of 6% import and 3% sales levies – the highest since May 2014. Last week, dealers offered a discount of up to $12.