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Every grading company uses its own grade names and notation for what is often the same level of quality — and some issue grades others don’t (half-points, qualifiers, Pristine/Perfect tens). The GemRate API reports all population and grade data under each grader’s own label keys, so the keys you read back match the grader you’re looking at. A label key is {grader}_{grade} — e.g. psa_10, beckett_9_5, cgc_10_perfect, sgc_10_pristine, qualifiers psa_q1…psa_q9. Decimals become underscores (8.5 → 8_5) and the top of scale carries an explicit tier segment (10_pristine, 10_perfect, 10_black). Every grades/qualifiers object in a response — on by_grader, on history points, and on the cert grade field — is keyed this way.

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The grade map

Grades fall on two axes:
  • The main ladder — Auth Altered, Auth, 1…9 (whole + half steps), Mint+ (9.5), Gem Mint (10), Pristine, Perfect. This is what almost everything is keyed by.
  • A PSA-only qualifier axis — psa_q1…psa_q9 plus psa_q1_5. These are PSA grades that carry a qualifier (e.g. OC, ST, MK). No other grader issues them, so this axis is null/absent for Beckett, SGC, and CGC.
The three top tiers — Gem Mint, Pristine, and Perfect — are the gem tiers: they’re what each grader’s gem_total / gem_rate count. A grader’s gem_total is the sum of exactly the label keys below; gem_rate is that sum over the grader’s total. Note each grader gems from its Gem Mint (10) up, so the exact keys differ:

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Each grader’s grades and label keys

Each grader reports under its own grade labels and label keys. The tables below list every grade a grader issues — its display label and the label key you read back in a response. (The 1.5 … 8.5 half grades follow the same pattern as the whole grades and are elided for brevity.)

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PSA

PSA qualifier axis:

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Beckett

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SGC

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CGC

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Download the full map

The complete map — every grade with each grader’s label key (grader_labels), display name (grader_names), and the PSA qualifier axis — is available to download as a JSON file, or to fetch live from the API. Download CSV