Gemfields falls 27% as Zambia imposes ban on gemstones sales

[caption id="attachment_716250" align="alignleft" width="280"] Gemfields named actress Mila Kunis as its brand ambassador earlier this year.[/caption] Precious stones miner Gemfields (LON: GEM), the world’s biggest emerald producer, said the Zambia government's ban on overseas auctioning of gemstones would hurt revenue...