I have noticed this. I have a FC Diver V2 and the crystal is amazing. I have a Black Themes and it is not quite as clear, so was thinking of doing AR.
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Well remember that the FC Diver v2 is a 44mm ROO and should have a colorless AR layer, as opposed to your black themes which is a 42mm ROO. Moreover, I believe the FC Diver from angus is *not* being manufactured by noob.
But I think it's a good observation as the 44mm ROO crystals should have slightly better clarity.