Meanwhile, PCGS is certifying at least 50,000 coins a month, down from the 70,000-a-month average earlier this year, and business is off at other coin-grading services, too.

Marketwatch reports that some very rare coins have made headlines by doubling in price over the past year, while prices on index from Professional Coin Grading Services (PCGS), have risen 16% ...

The four top grading services, ranked in order of the acceptance of the grades they apply are PCGS, NGC, ICG and ANACS, and this ranking will also demonstrate the difference in values assigned to ...

Independent, or third party services, such as PCGS (Professional Coin Grading Service) and NGC (Numismatic Guaranty Corporation) are the two most popular and prominent services available. There ...