Lab-grown stones are booming, threatening to crush the diamond trade. So, how is the industry coping? And what does this mean for Botswana, a country whose schools, hospitals, roads, and economy have been built by the profits from diamond mining? 

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Guest: Richard Assheton, foreign features, The Times and The Sunday Times.

Host: Manveen Rana.

Producer: Dave Creasey.

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