What is a gem rate? Use it as historical evidence

What is a gem rate? Use it as historical evidence

A gem rate is the share of a recorded grading population that received the designated gem grade. For the PSA records here, it is the recorded PSA 10 share. Submitted cards are a selected population: owners choose what to submit, and condition, inspection skill and submission mix differ.

What to verify for this topic

Use a population rate as a modeling assumption, then challenge it against the card in front of you. A high historical share cannot make a damaged copy a strong submission. A lower-grade result may still have resale value, so calculate each supported grade outcome rather than treating every miss as worthless.

How to calculate a PSA gem rate

For one exact card population, divide the recorded PSA gem-mint count by the recorded total, then express the result as a percentage. The numerator and denominator must use the same card identity, grading company, source date and population scope. A set-wide percentage cannot replace the percentage for one foil treatment or numbered printing.

Check what the source includes in its total. PSA separates whole-number grades and Authentic designations, half-point grades, and qualifiers into distinct lines in its population report. Combining a numerator from one scope with a denominator from another creates a different statistic. On this site, a source's complete total may exceed the sum of its standard-grade buckets; do not silently substitute one denominator for the other.

Does a high gem rate mean my card will grade well?

No. The population describes submitted cards, not a random sample of every raw copy for sale. Your copy can have different centering, corners, edges or surface condition. A seller's condition label does not remove that uncertainty. Use the historical rate to frame a scenario, then inspect the specific copy and consider lower-grade outcomes before deciding what to pay.

A percentage also hides sample size. Read the population count beside the rate: a small recorded sample provides less evidence about the range of submitted copies. Neither a large sample nor a high percentage guarantees your next result.

All-time gem rate versus recent grading activity

An all-time share describes the accumulated population at a source date. It does not show how many cards were graded this month. A newly refreshed page does not make an old monthly field current. Recent activity needs observations for the relevant period, with consistent identities and coverage. Until that evidence is available, treat this site's all-time rankings as all-time rankings.

Use the rate in a purchase decision

Start with the exact printing in Card Explorer. Review the population and source, inspect recent sold comparisons for matching language and variant, and enter your actual purchase assumptions. Compare the modeled expected result with the conditional top-grade outcome. Add costs the model excludes, and save the analysis so you can revisit the same assumptions before submitting. If the case only works under an unsupported grading probability, the evidence is not ready for a purchase decision.

Dated reference examples

Captured September 5, 2026. These are database reference prices, not independently verified recent sold comparables or buy recommendations. Each linked record identifies its set and source.

Pikachu 20th Anniversary Festa #279/XY-P — Pokemon Japanese Promo

Mario Pikachu #294/XY-P — Pokemon Japanese Promo

Poncho-Wearing Pikachu #207/XY-P — Pokemon Japanese Promo

Poncho-Wearing Pikachu Charizard #208/XY-P — Pokemon Japanese Promo

Read the model correctly

The comparison uses a $25 PSA Value Bulk model fee and a 13% selling fee. Verify current service eligibility, declared-value limits and possible upcharges before submitting. The table excludes shipping, tax, insurance, supplies and time costs.

Expected net profit weights resale outcomes across the recorded grade distribution, applies the selling fee, and deducts raw and grading costs once. PSA 10 net profit assumes the card receives PSA 10. PSA 10 ROI divides that conditional profit by raw plus grading cost. It is not expected ROI.

Historical population shares are assumptions for this calculation, not personal grading probabilities. Missing grade-price references may use the engine's raw-price fallback; unmodeled outcomes and sparse records can materially change the result. Inspect the current card detail and replace reference inputs with your actual costs and verified sold evidence.

Incomplete outcome pricing in this snapshot: Pikachu 20th Anniversary Festa #279/XY-P; Mario Pikachu #294/XY-P; Poncho-Wearing Pikachu #207/XY-P; Poncho-Wearing Pikachu Charizard #208/XY-P. Treat their expected results as provisional.

Build a repeatable decision

Open a card record, check the exact variant and source, adjust the purchase assumptions, and save the analysis to your account. Revisit it before buying or submitting. The methodology explains the model; Pro describes the available research features. A saved analysis records a decision assumption, not a realized return.

Correction — September 5, 2026: Removed invented individual grading probabilities, unsupported grading-company comparisons and universal profit thresholds. The URL is preserved so earlier links lead to the correction. The current table replaces the historical figures with a dated, explicitly labeled model snapshot.

Guide expanded — September 9, 2026: Added denominator checks, sample-size context and the distinction between all-time population and recent activity. The reference table retains its original snapshot date.