A rare 25-carat pink diamond is among the millions of dollars worth of jewellery seized from the Philippines’ former first lady Imelda Marcos that will now be publicly auctioned, after years of her contesting the move in court.President Rodrigo Duterte, an ally of the Marcos family, has formally approved the sale of three jewellery sets, his executive secretary confirmed on Tuesday. The items, estimated to be worth about US$19 million in 2015, include Indian diamonds, Burmese rubies and…