So let's say we etch a QR code into each diamond which is only visible with a microscope. This is not unfeasible. In fact "Polar Bear" diamonds carried an etc

So let's say we etch a QR code into each diamond which is only visible with a microscope. This is not unfeasible. In fact "Polar Bear" diamonds carried an etching of a polar bear. [1] So once you have the etching of a QR code then it makes sense for a blockchain, because then it makes determining the provenance for a diamond easier. And you could track stolen diamonds much, much easier. Though, I would be disappointed if DeBeer's only allowed it for their diamonds only. [1] https://www.theglobeandmail.com/news/national/diamonds-mined-in-nwt-to-carry-tiny-polar-bear-symbol/article25466673/ https://www.theglobeandmail.com/news/national/diamonds-mined...