A luxury mobile phone that has diamonds as control buttons is to go on sale for £200,000 (= EUR 300,000; USD 376,000) The Black Diamond smartphone was designed by Jaren Goh and is built by Swiss firm VIPN. The menu navigator button is a 0.25 carat diamond while more diamonds decorate the titanium body. The Black Diamond phone also changes colour from silver to black when not in use. Only five are being made and the phone is expected to be available from early next year. Three Americans, a Russian and the Sultan of Oman are all said to have expressed an interest.