Diamond trade - which countries are the bigger markets

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I wonder if someone on this site can help me. I am doing a project on diamonds and wanted to know which countries had the biggest markets for diamonds?

I have searched on google, but not had much luck with relevant articles or numbers. From what I have seen it appears that the US is the largest market, followed by Japan. Can tell me where the UK, Canada and Australia are?

Thanks in advance for any help

 

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Anyone? Please??