Numismatic Guaranty Corporation (NGC) is the world’s largest third-party coin authentication and grading service with more than 31 million coins graded since it was founded in 1987. NGC has one primary objective: accurate, consistent and impartial coin grading. Coins are graded by NGC on the internationally recognized Sheldon scale of 1 to 70. The highest grade, 70, is defined as having no post-production imperfections visible at 5x magnification. Multiple professional graders examine every coin to ensure accuracy and consistency.
NGC employs more than 30 full time professional graders, all of whom are prohibited from buying and selling coins commercially to ensure impartiality. Every coin that NGC grades is backed by the comprehensive NGC guarantee of grade and authenticity, the strongest in the industry.The NGC guarantee, coupled with a record of accurate and consistent grading built over nearly 30 years, results in higher prices and greater liquidity for NGC-certified coins.
NGC-graded coins are encapsulated in the advanced NGC holder, the same tested and used by the Smithsonian Institution. Designed for long-term preservation and protection, the NGC holder features numerous security features to deter counterfeiting and tampering.The American Numismatic Association (ANA), the only coin collecting organization charted by the US Congress, and the Professional Numismatists Guild (PNG) have both named NGC their official grading service.