Coin grading explained: from UNC to G

Grade is the single biggest lever on what a coin is worth. Two pieces of the same date and mint can sit a few dollars apart or thousands apart, and almost all of that gap comes down to condition. Learn to read the grading language and you stop guessing at prices — you start reading them.

What grading actually measures

A grade is a shorthand for how much wear, contact, and original surface a coin has. It rolls up several things at once: the sharpness of the high points (a cheek, a wing, the top of a wreath), how many tiny contact marks the fields carry, whether the original mint luster is intact, and how much eye appeal the coin has overall. None of these is the whole story on its own — a grade is the market's compressed verdict on all of them together.

Think of it as a ladder. Each rung up means less wear and more of the coin as it left the press. The premiums between rungs are rarely even: near the bottom they're small, near the top they explode.

The grades, top to bottom

• Uncirculated / Mint State (MS): Never spent. No wear at all on the high points, though there can be minor bag marks from minting and handling. On the numeric scale this spans MS-60 through MS-70, and within that band a couple of points can multiply the price.
• About Uncirculated (AU): Only the faintest rub on the very highest points; most of the original luster survives. Easy to mistake for Uncirculated at a glance.
• Extremely Fine (XF / EF): Light, even wear on the high points, but every fine detail is still crisp. A strong, honest collector grade.
• Very Fine (VF): Moderate wear across the design. Major features are bold; the finest details are softened but present.
• Fine (F): Considerable, even wear. The design is complete and legible, but flattened in places. This is where a great many circulated coins land.
• Very Good (VG) / Good (G): Heavy wear. The rim and main outlines hold, but inner detail is mostly worn away. Still collectible for scarce dates where nicer examples are out of reach.

Why the jumps aren't even

The value gap between adjacent grades is almost never linear. From Good to Fine you might add a little. From XF to Mint State on a scarce date you can multiply the price several times over, because truly unworn survivors are rare. This is the core reason grading matters so much: a single grade step near the top of the ladder can be worth more than the entire coin one rung down.

How to grade your own coins

• Use raking light. Tilt the coin under a single light source so wear and luster show as a contrast, not a flat glare.
• Read the high points first. Wear always shows up earliest on the most raised areas. If those are sharp, you're high on the ladder.
• Look for luster. That rotating "cartwheel" sheen across the fields is original mint surface. Once it's broken by wear, you're below Mint State.
• Be honest, then go one grade lower. Almost everyone over-grades their own coins. A conservative call protects you when you buy and sell.

Where this leaves you

Grade is self-assessed in the app as a quick aid — it is not professional certification, and the value figures you see are market reference range estimates, not appraisals or investment advice. But once you can place a coin on this ladder with a steady eye, every price you encounter starts to make sense. You'll see instantly why one example is pocket change and a near-identical one is a prize.