Assertion: coin | /r/HasProperty | graded by ngc
Facets:
Source sentences:
text: If you are unsure about coin grading and you want to buy higher quality coins, then I would suggest that you buy coins that have already been graded by a third-party grading service such as PCGS, NGC, or ANACS.
text: The first is certified, which means that the coins have been certified and graded by a professional rating company, such as PCGS or NGC.