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Scot ReaderPSA's GEM MINT 10 is a business construct designed to inflate the value of a small percentage of cards (and by extension the value of PSA services) beyond what should objectively be realized. It has succeeded as a business construct but fails as a logical construct.
SGC is even worse than PSA on this count. It has separate categories for GEM 98 and PRISTINE 100 which extend this artifice even further.
In my book, a card is either MINT or it is not. No grade should exist above MINT.