Coin Grading Explained
Coin grading rates a coin's condition on the Sheldon scale from 1 (barely identifiable) to 70 (flawless under magnification). Independent services such as PCGS and NGC grade coins and seal them in tamper-evident holders. Grading can matter a great deal for rare and collectible coins; for common modern bullion, the value comes overwhelmingly from the metal, and a high grade mainly adds premium.
Where the 70-Point Scale Came From
The numeric scale traces back to William Sheldon, who proposed it in 1949 in a study of early American large cents. His system tied numbers to market value for those coins; collectors later adapted it to describe condition across all U.S. and many world coins. Today it is the standard language of the American coin market, and both major grading services use it.
Reading the Scale
| Grade range | Abbreviation | What it describes |
|---|---|---|
| 1–3 | P, FR, AG | Poor to About Good; heavy wear, design barely visible |
| 4–10 | G, VG | Good to Very Good; major details worn but outline clear |
| 12–35 | F, VF | Fine to Very Fine; moderate wear, most detail present |
| 40–45 | EF or XF | Extremely Fine; light wear on high points |
| 50–58 | AU | About Uncirculated; trace wear only |
| 60–70 | MS | Mint State; no wear, graded by marks, luster and strike |
| 60–70 | PR or PF | Proof; specially struck coins graded on the same top range |
Within Mint State, the difference between grades comes down to small contact marks, the strength of the strike, the quality of the luster and overall eye appeal. An MS-70 coin shows no post-production imperfections at 5x magnification. MS-69 allows minute flaws that most people couldn't see without a loupe.
"Proof" is a method of manufacture, not a grade. Proof coins are struck on specially prepared blanks with polished dies, often more than once, for collectors. They receive PR or PF grades on the same numeric range. Our guide to proof vs bullion coins explains the differences.
How Third-Party Grading Works
The two largest services are PCGS (Professional Coin Grading Service) and NGC. The process is broadly similar at both:
- A coin is submitted, typically through a dealer or a collector membership.
- Graders examine it independently, checking authenticity and condition.
- A final grade is assigned, and the coin is sealed in a hard plastic holder, often called a "slab," with a label showing the grade and a certification number.
- The certification number can be looked up on the service's website to confirm details and, in many cases, images.
Grading is an expert opinion, not a lab measurement. The same coin can occasionally receive a different grade on resubmission, and services publish their own standards. Neither PCGS nor NGC tells you what a coin is worth; prices come from the market.
Label designations
Labels sometimes carry extra wording, such as "First Strike," "Early Releases," or a signed label. These usually indicate when a coin was submitted or who signed the label, not a different coin from the mint. They may add premium in the collector market, but buyers should understand that the metal and design are the same as unlabeled examples.
When Grading Matters
For collectors
For older and scarcer coins, grade can drive value enormously. A one-point difference in a key-date coin can change its price many times over. Certification also provides authentication, which matters wherever counterfeits exist. Our page on numismatic vs bullion coins covers this market.
For bullion buyers
For modern bullion coins such as the American Gold Eagle or Silver Maple Leaf, millions of near-identical coins exist. An MS-70 example holds exactly the same metal as an ungraded one from a mint tube. The added price of the slab and the grade is a premium that depends on collector demand when you sell, and that demand can fade. If your goal is metal ownership, ungraded bullion usually means more metal per dollar. See premiums and spreads for how that affects total cost.
In retirement accounts
The IRS rules on fineness and the American Eagle exception apply to the coin itself, not the holder. Some custodians accept certified coins that are otherwise eligible, while others prefer raw bullion. Because graded coins carry collector premiums, it's worth asking whether that premium serves the purpose of the account. Our page on the collectibles rule explains the legal framework.
Grading and Goldco
Goldco, a precious metals company, lists standard bullion coins such as the American Gold Eagle and Silver Maple Leaf alongside many themed and commemorative coins. Our page on gold coins available through Goldco describes what it lists. Its precious metals specialists can explain the difference between products, but they are not licensed to give financial advice, so weigh the comparison yourself or with a licensed professional.
Frequently Asked Questions
What does MS-70 mean?
Mint State 70, the highest grade: a coin with no visible imperfections under 5x magnification.
Is PCGS or NGC better?
Both are long-established and widely accepted. Market pricing can differ slightly by service for certain coins, so collectors often compare.
Should I get my bullion coins graded?
For common modern bullion, the grading cost often exceeds any added value unless the coin is likely to grade at the very top of the scale and collector demand is strong.
Can I verify a graded coin online?
Yes. Both PCGS and NGC offer certification lookups by the number printed on the label.