The loupe catches what the scale, calipers, and magnet cannot — cleaning, polishing, whizzing, dipping. Beginners lose more money to bad surfaces than to outright fakes.
Set your baseline first
Study known-genuine certified coins under the loupe before you judge anything else. You cannot spot “wrong” until you know what right looks like.
The fixed sequence
- Rake light at a low angle across the surface — hairlines and polishing only show in angled light.
- Scan in zones: fields, then devices, then rim — then flip and do both sides.
- Vary your focus distance. Some problems hide at one depth and jump out at another.
- Compare constantly against your baseline coins.
Catalog of “wrong”
- Hairlines from wiping or cleaning
- Polished, dead surfaces with no luster life
- Whizzing swirls from rotary buffing
- Dipped-out gray wash with stripped luster
- Recess mismatch — protected areas that do not match the fields
Build a reference album
Shoot phone photos through the loupe of every coin you examine — good and bad. Your personal album becomes the fastest teacher you own.
A photograph can inform a decision, but it cannot authenticate or certify a coin.