A Faberge sapphire and diamond Devotion ring is seen at the Gemfields office in central London, November 17, 2014. Gemfields, the world's largest rough emerald producer, expects to take up to two more years to have stopped the losses at the Faberge jewellery business it bought two years ago, its chief executive, Ian Harebottle, said. London-listed Gemfields, which mines emeralds in Zambia and rubies in Mozambique, bought Faberge in the hope that the brand made famous by Peter Carl Faberge's Russian Easter eggs would help boost demand for jewellery featuring coloured gemstones. Picture taken November 17, 2014. To match Interview GEMFIELDS/CEO REUTERS/Toby Melville (BRITAIN - Tags: BUSINESS COMMODITIES SOCIETY WEALTH)