What a grade measures
PSA and BGS assess four things: print centring, corners, edges and surface (scratches, print defects, pressure marks). The final grade summarises those four observations on a 1 to 10 scale.
A grade says nothing about scarcity or price. It describes a physical condition at a given date, verified by a third party, and it prevents later tampering because the card is sealed.
The PSA scale
PSA 10 Gem Mint: visually flawless, roughly 55/45 front centring, sharp corners, clean surface. PSA 9 Mint allows one minor flaw, usually slight off-centring or a small surface mark.
PSA 8 accepts light corner wear or 65/35 centring. Below PSA 7 defects are visible to the naked eye. Between a 9 and a 10 the visual difference can be invisible to an untrained eye while the price gap is a multiple.
BGS and its composite grade
BGS prints four subgrades then an overall grade. The overall is weighted, not averaged: the lowest subgrade pulls it down heavily.
BGS 9.5 Gem Mint is the high-end standard. BGS 10 Pristine is rare, and Black Label means a 10 with four perfect subgrades — a handful of copies for some references.
Reading the slab
The label shows the card name, year, set, language, any variant note and a certification number. Check that number free of charge on the grader's site: it must return the same card, grade and photo.
A scratched or yellowed case, or a label that shifts inside it, deserves suspicion. Counterfeit slabs copy the case, never the grader's database.
Japanese cards in particular
Japanese print runs are often better centred than western ones, which is why some sets produce more PSA 10s. That does not devalue the grade, it changes which comparables to look at.
Always check the language line on the label: the same artwork can exist in Japanese, English and Korean at very different values.
Frequently asked questions
What is the difference between PSA 10 and BGS 9.5?
PSA 10 is PSA's top grade and means no visible defect. BGS 9.5 is the equivalent high-end BGS grade, with four subgrades printed on the label. Both sit at a similar level of desirability; above them, BGS 10 and Black Label are far scarcer.
How do I check a slab is genuine?
Take the certification number from the label and enter it in the grader's online verifier. The record must show the same card, the same grade and, with PSA, the same photograph. A number missing from the database means a counterfeit.
Can a graded card lose its grade?
As long as the case stays sealed, the grade stands. Cracking the slab returns the card to raw condition and it must be regraded. That is why a cracked or resealed case destroys value.
Should I resubmit a card for a better grade?
Rarely. Regrading costs money, takes weeks and can come back the same or lower. It only makes sense when the price gap between the current and hoped-for grade is large and the noted flaws look borderline.
Are Japanese graded cards worth more than western ones?
Not systematically. Some older Japanese references trade above their western equivalents because of smaller print runs; others trade below because PSA 10s are more common. Compare reference by reference, not language by language.