pot platinum prices rose on Thursday as the start of the futures trading on the China's Guangzhou bourse provided support to the overall liquidity for the metal. The contracts are the first domestic price-hedging mechanism for platinum and palladium in the world's second-largest economy, where the metals are used by auto makers and other industries, including jewellery and investment products. Guangzhou's platinum futures for June delivery jumped by 6% on their first day of trading, while palladium gained 1.5%. Spot platinum prices in London were up 1.0% at $1,604 per troy ounce by 1226 GMT after hitting $1,641, ... (full story)