Understanding coin grades
What coin grades mean, how wear is assessed and why condition has such a strong effect on a coin's value.
What a grade describes
A grade is a shorthand for how much wear a coin has, from heavily circulated to never used. Grading is about the surface and detail that remain, not about rarity or age.
Two coins of the same type can differ enormously in value purely because of their grade, so a consistent vocabulary matters when buying, selling or trading.
The common grading steps
A widely used scale runs from Poor and Fair through Good, Very Good, Fine and Very Fine, up to Extremely Fine, About Uncirculated and Uncirculated. Each step reflects how much of the original detail survives.
Proof is not a grade but a method of manufacture: specially struck collector coins with mirror fields. They are described separately from circulation grades.
Where to look for wear
Wear shows first on the highest points of the design: the cheekbone of a portrait, the centre of a coat of arms or the topmost leaves of a wreath. Examine these areas under good light at an angle.
Original mint lustre, the faint sheen left by striking, fades as a coin circulates. Its presence is one of the clearest signs of a high grade.
Why grade drives value
For most types, well-preserved examples are far scarcer than worn ones, so price rises sharply with grade. The catalogue shows value ranges per grade so you can see this curve for a given coin.
Avoid cleaning coins to improve their look. Cleaning removes original surface and almost always lowers the value rather than raising it.