what is ngc
NGC is the acronym for the Numismatic Guaranty Corporation. NGC is one of the worldâs two upper echelon coin grading services, the other being PCGS (Professional Coin Grading Service).nvestors do not purchase coins based on those factors. Instead, savvy investors look for NGC coins that have a relatively low premium over the gold spot price, coins with a historical profit-to-loss ratio that favors profit and coins that have a steady and trackable resell market.