This, only USA Certed knows for sure. I thought those would be acronyms on the cert (surprising, since I had no idea of such) - but no, these are listed by the seller for their own use... Sorry I could not help
Welcome, My wild guess as to the PNS note is that the neither the pavilion angle or pavilion percentage is shown on the listing. Perhaps it means Pavilion Not Shown.Usually they might list one or the other.
These are probably shorthand notes by the wholesaler who owns the stone and could (I'm only guessing here) refer to the cert comments...PNS = pinpoints not shown...APP = additional pinpoints (not shown - it usually says).
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