I assume the bag was sealed, so when the (nonexistent) buyer came they would easily be able to see that the diamonds they were looking at were the same ones their employees had inspected previously.
I am failing to find an article I read a while ago on making physical seals with what basically amounted to glitter glue, based on the idea that it’s unfeasible to precisely reproduce a distinct random pattern of 10’000+ glitter particles in a seal … which I thought was pretty neat.
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