Cardi B Shows Off $500k Engagement Ring at Ace of Diamonds

[[tmz:video id="0_c6njdkvb"]] Cardi B has a message to haters who don't believe she's really rocking a $500k ring -- just watch me shine! The "Bodak Yellow" rapper and her fiance, Offset, hit up Ace of Diamonds in WeHo Monday night and we asked…