Grading a coin is the act of describing its condition in a way that another person, across a table or across the country, can understand without holding it. The whole system exists because two people looking at the same coin can disagree about what they see, and grading gives them a shared language for the disagreement.
This is not a guide to becoming a professional grader. The major third-party grading services, PCGS and NGC, employ specialists who have spent years calibrating their eyes, and their sealed holders carry the weight they carry because of that expertise. What this piece covers is grading literacy: understanding the scale, knowing what to look for, and being able to make a reasonable assessment of what you are holding before you decide what to do with it.
The Sheldon scale
The standard coin grading scale runs from 1 to 70. It was created by Dr. William H. Sheldon and first presented in 1949 in his work on early American large cents. The original purpose was specific: he wanted a quantitative way to describe the condition of a particular series. In the 1970s the American Numismatic Association adapted the scale for use on all United States coins, and the major grading services, PCGS, NGC, and ANACS, adopted it as their standard.
The scale breaks into two large zones: circulated grades (1 through 58) and uncirculated grades, called Mint State (60 through 70). A coin graded 1 is barely identifiable. A coin graded 70 has no trace of wear and no visible imperfections under magnification. Everything between is a description of how much of the original detail survives.
Circulated grades: what wear looks like
A circulated coin has been handled, spent, and passed through pockets and cash registers. The question is how much of that journey shows on the surface.
At the bottom of the circulated range, Poor (grade 1) and Fair (grade 2) describe coins worn nearly smooth, with just enough detail to identify. These are coins you can identify by shape and size more than by detail. About Good (grade 3) shows readable lettering but very heavy wear across the whole surface.
Good (grades 4 and 6) is where the coin becomes clearly identifiable, with the design visible though faint in areas. This is the grade range where most heavily circulated coins from the nineteenth and early twentieth centuries land.
Very Good (grades 8 and 10) shows more detail. On a Liberty Head design, two or three letters of LIBERTY are visible at grade 8 and five or six at grade 10. The design is worn but distinct, and the coin reads as a coin, not as a disc with marks on it.
Fine (grades 12 and 15) is where the lettering becomes sharp across the whole coin. Moderate wear is visible on the high points, but the overall design is clear and complete.
Very Fine (grades 20 through 35) covers coins with light to moderate wear on the higher features. All lettering and major features are sharp. In the upper Very Fine grades, traces of the original mint luster may begin to show.
Extremely Fine (grades 40 and 45) shows light wear only at the highest points. The coin still carries most of its original detail, and the wear is visible mainly as a slight flattening on the very peaks of the design.
About Uncirculated (grades 50, 55, and 58) is the transition zone. These coins show only traces of wear at the absolute highest points. At AU-58, almost all of the original mint luster remains, and the wear is so slight that the difference between a high AU and a low Mint State coin is one of the hardest calls in grading.
Mint State grades: the uncirculated range
A Mint State coin has never circulated. It was struck, left the press, and was stored without being spent. But “never circulated” does not mean “perfect.” Coins contact other coins in mint bags, in rolls, and during transportation. Those contact marks, called bag marks, are the primary factor that separates the Mint State grades from each other.
MS-60 is the entry point. The coin has no wear, but it may have heavy bag marks, dull or washed-out luster, and poor eye appeal. An MS-60 coin is uncirculated but not attractive.
MS-63, called Choice Uncirculated, is where the coin starts to look pleasing. Luster is slightly impaired, contact marks are present but not distracting, and the overall appearance is attractive. This is a common grade for coins that were stored without special care.
MS-65, Gem Uncirculated, is a meaningfully better coin. The luster is strong, contact marks are minor and not in focal areas, and the eye appeal is above average. The gap between 63 and 65 is visible to a practiced eye and substantial in the market.
MS-67 and above describe coins with sharp strikes, full original luster, and exceptional eye appeal. Contact marks are trivial if present at all. These grades are uncommon for most series, and the scarcity at each level above 65 increases sharply.
MS-70 is the theoretical perfect coin: full strike, full luster, no marks, no hairlines, no imperfections of any kind under magnification. For older coins, MS-70 is essentially non-existent. For modern coins struck with better technology and handled with greater care, it is rare but achievable.
What to look at
Four things determine a coin’s grade, and they apply whether you are grading circulated or uncirculated pieces.
Luster is the way light reflects off the coin’s surface. On a freshly struck coin, the metal flows under the pressure of the die and creates a characteristic cartwheel effect when you tilt the coin under a light. Circulation dulls this. Cleaning destroys it, and that sentence deserves its own paragraph.
Never clean a coin. Not with a polishing cloth, not with a dip, not with soap and a soft brush, not with anything, ever. Cleaning is the one irreversible act a holder can commit against a coin: it strips the surface the grade lives on, the damage cannot be undone, and experienced buyers and professional graders detect it immediately. A worn original coin is worth more than the same coin cleaned bright. If a coin looks dirty, sell it dirty and let the buyer decide.
Luster is the first thing to assess because it tells you immediately whether the coin has been circulated, cleaned, or artificially enhanced.
Strike describes how completely the die transferred the design to the planchet. A well-struck coin shows full detail in the deepest recesses of the design. A weakly struck coin has mushy or incomplete detail in areas where the die did not press fully, even if the coin has never circulated. Strike is a quality of manufacture, not of preservation, and it factors into the grade because a weak strike limits how much detail the coin can show.
Contact marks and surface preservation are the wear and damage accumulated after striking. On circulated coins, this is the wear from handling. On uncirculated coins, this is the bag marks, hairlines, and minor surface disturbances from storage and transportation. Where the marks sit matters: a mark on the cheek of a portrait is more distracting than one on the field behind it, and graders weigh location alongside severity.
Eye appeal is the subjective assessment that ties the other three together. Two coins can have similar luster, similar strike, and similar surface preservation and still not look the same to a buyer. The one that looks “right,” that has pleasing toning or a particularly sharp impression of the design, has better eye appeal, and that difference can move it a point or two on the scale.
What grading is not
Grading is not authentication. A coin can receive a grade and still be a forgery if it slips past the authenticator. The major services authenticate and grade as a combined process, but the two are different skills addressing different questions.
Grading is also not pricing. The grade describes what the coin is. The market decides what it is worth. Two coins at the same grade can sell at very different levels depending on the series, the date, the mintmark, and how many examples exist at that grade. The grade is one input to the pricing question, not the answer to it.
And grading your own coins honestly is harder than grading someone else’s. The coin you own looks better to you than it looks to a buyer, every time; the bias comes with holding the piece you are evaluating, and it affects everyone. The corrective is experience: handle enough coins, compare enough grades, and your calibration improves. The other corrective is third-party grading, where somebody with no stake in the outcome does the assessment.
When to send a coin for professional grading
Third-party grading by PCGS or NGC puts the coin in a sealed holder with the grade printed on the label. That holder carries market trust that a self-assessed grade does not, and for certain coins the holder is the difference between a confident buyer and a skeptical one.
The decision is straightforward: if the grading cost is a small fraction of the coin’s value and the holder meaningfully increases buyer confidence or the realized price, send it. If the grading cost is a significant portion of the coin’s value, the holder is unlikely to return its cost, and your own honest assessment in the listing description is sufficient.
Common circulated coins in grades below Very Fine are rarely worth the grading fee. Scarce coins, key dates, and anything in the upper circulated or Mint State range benefit the most from the holder. The holder changes nothing about what the coin is; what it changes is how much of that the buyer is willing to trust.
How to photograph a coin so the buyer can see what the grade describes is its own discipline, and it has a companion piece in this group.