It is impossible to find any sort of data or traceabilty for diamonds used in tooling because it is not one single gemstone like the jewellery industry.
It is a fine diamond powder which is bonded to a steel tool.
Having said that industrial grade diamond is so cheap compared to gem quality I would guess there is no need to cut corners and deal with dubious dealers.
My initial thinking was that industrial grade diamonds are mostly artificial.
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If dubious dealers come in to possession of low grade diamonds, would they not offer a deal?
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It's hard to believe that mines with poor ethical practices ONLY sell the highest quality diamonds. That's a weird concept.
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