US-led Western export controls on Russian diamonds have hit the world’s largest cutting and polishing hub, which had already been left reeling from the Covid-19 slowdown It was a routine morning at Ketan Patel’s home as he braced for what would have normally been another grueling day as an artisan at a diamond firm in Surat. Surat, the hub of the global diamond polishing industry, is located in Gujarat, in western India, Prime Minister Narendra Modi’s home state.  The city's diamond industry,

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