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Some jewellers specialise in seling ethical and Fair Trade diamonds
A reputable jeweller or diamond merchant should be able to provide assurance that the stones they are selling are conflict free and certified by the Kimberly Process- something the UN started to prevent the trade of conflict diamonds. It's not a perfect system, but it's certainly a good start.
I heard the Cartier SA mentioned that their diamonds go thr' the Kimberly Process---does anyone know anymore about that? He basically made it sound like that if the diamond goes thr' this process officially, then every path, hand or anything that touches this diamond is documented so that should lead to less likely to be "bad/conflict diamonds".