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The PDF report is called "Sapphire Rush in the Jungle East of Ambatondrazaka, Madagascar", it happened October 21st to 26th (i.e. just a few days go) it's by gem trader Rosey Perkins and it's a great read that's taken up at least a part of my morning.
My thanks to reader B for sending in the link. Hopefully this post means more people will enjoy the report as much as I did.