Grade a trading card using PSA, BGS, or CGC standards. Covers observation-first assessment (adapted from meditate's unbiased observation), centering measurement, surface analysis, edge and corner evaluation, and final grade assignment with confidence interval. Supports Pokemon, MTG, Flesh and Blood, and Kayou cards. Use when evaluating a card before professional grading submission, pre-screening a collection for high-grade candidates, settling condition disputes between buyers and sellers, or estimating the grade-dependent value spread for a card.
merceralex397-collab2 星標2026年4月7日
職業
分類
占卜同玄學
技能內容
Assess and grade a trading card following professional grading standards (PSA, BGS, CGC). Uses an observation-first protocol adapted from the meditate skill to prevent grade anchoring — the most common grading bias.
When to Use
Evaluating a card before submission to a professional grading service
Pre-screening a collection to identify high-grade candidates worth submitting
Settling disputes about card condition between buyers and sellers
Learning to grade consistently by following a structured assessment protocol
Estimating the grade-dependent value spread for a specific card
Required: Card images or physical description (front and back)
Required: Grading standard to apply (PSA 1-10, BGS 1-10 with subgrades, CGC 1-10)
Optional: Known market value at different grades (for grade-value analysis)
Optional: Card game (Pokemon, Magic: The Gathering, Flesh and Blood, Kayou)
相關技能
Procedure
Step 1: Clear Bias — Observation Without Prejudgment
Adapted from meditate Step 2-3: observe the card without anchoring to expected grade or market value.
Set aside any knowledge of the card's market value
Do NOT look up recent sales or population reports before grading
If you know the card is "valuable," acknowledge that bias explicitly:
"I know this card is worth $X in PSA 10. I am setting that aside."
Examine the card as a physical object first, not as a collectible
Note your initial gut impression but do NOT let it anchor the assessment
Label any premature grade thoughts as "anchoring" and return to observation
Expected: A neutral starting state where the card is assessed purely on physical condition, not market expectations. Grade anchoring (knowing the value before grading) is the #1 source of grading inconsistency.
On failure: If bias feels sticky (a high-value card makes you want to see a 10), write down the bias explicitly. Externalizing it reduces its influence. Proceed only when you can examine the card as a physical object.
Step 2: Centering Assessment
Measure the card's print centering on both faces.
Measure the border width on all four sides of the front face:
Left vs. right border (horizontal centering)
Top vs. bottom border (vertical centering)
Express as ratio: e.g., 55/45 left-right, 60/40 top-bottom
Repeat for the back face
Apply the grading standard's centering thresholds:
PSA Centering Thresholds:
+-------+-------------------+-------------------+
| Grade | Front (max) | Back (max) |
+-------+-------------------+-------------------+
| 10 | 55/45 or better | 75/25 or better |
| 9 | 60/40 or better | 90/10 or better |
| 8 | 65/35 or better | 90/10 or better |
| 7 | 70/30 or better | 90/10 or better |
+-------+-------------------+-------------------+
BGS Centering Subgrade:
+------+-------------------+-------------------+
| Sub | Front (max) | Back (max) |
+------+-------------------+-------------------+
| 10 | 50/50 perfect | 50/50 perfect |
| 9.5 | 55/45 or better | 60/40 or better |
| 9 | 60/40 or better | 65/35 or better |
| 8.5 | 65/35 or better | 70/30 or better |
+------+-------------------+-------------------+
Record the centering score for each axis and the applicable subgrade
Expected: Numeric centering ratios for both faces with the corresponding grade/subgrade identified. This is the most objective measurement in the grading process.
On failure: If borders are too narrow to measure accurately (full-art cards, borderless prints), note "centering N/A — borderless" and skip to Step 3. Some grading services apply different standards for borderless cards.
Step 3: Surface Analysis
Examine the card's surface for defects.
Examine the front surface under good lighting:
Print defects: ink spots, missing ink, print lines, color inconsistency
Surface scratches: visible under direct and angled light
Whitening on surface: haze or clouding of the surface layer
Indentations or impressions: dents visible under raking light
Staining or discoloration: yellowing, water marks, chemical damage
Examine the back surface with the same criteria
Check for factory defects vs. handling damage:
Factory: print lines, miscut, crimping — may be less penalized
Near-pristine (9-9.5): minor imperfections visible only under magnification
Excellent (8-8.5): minor wear visible to naked eye
Good (6-7): moderate wear, multiple minor defects
Fair or below (1-5): significant damage visible
Expected: A detailed surface inventory with each defect located, described, and severity-rated. Factory vs. handling defects distinguished.
On failure: If images are too low-resolution for surface analysis, note the limitation and provide a grade range rather than a point grade. Recommend physical inspection.
Step 4: Edge and Corner Evaluation
Assess the card's edges and corners for wear.
Examine all four edges:
Whitening: white spots or lines along colored edges (the most common defect)
Chipping: small pieces of the edge layer missing
Roughness: edge feels uneven or has micro-tears
Foil separation: on holofoil cards, check for delamination at edges
Examine all four corners:
Sharpness: corner tip is crisp and pointed
Rounding: corner tip is worn to a curve (slight, moderate, heavy)
Splitting: layer separation visible at corner (dings)
Bending: corner turned or creased
Rate edge and corner condition using the same scale as surface
Note which specific corners/edges have the worst condition
Expected: Per-edge and per-corner condition assessment. The worst individual corner/edge typically limits the overall grade.
On failure: If the card is in a sleeve or toploader that obscures edges, note which areas couldn't be fully assessed.
Step 5: Assign Final Grade
Combine sub-assessments into the final grade.
For PSA grading (single number 1-10):
The final grade is limited by the weakest sub-assessment
A card with perfect surface but 65/35 centering caps at PSA 8
Apply the "lowest limits" principle, then adjust up if other areas are exceptional
Overall = weighted average, but the lowest subgrade limits the overall
BGS 10 Pristine requires all four subgrades at 10
BGS 9.5 Gem Mint requires average of 9.5+ with no subgrade below 9
For CGC grading (similar to PSA with subgrades on label):
Assign Centering, Surface, Edges, Corners
Overall follows CGC's proprietary weighting
State the final grade with confidence:
"PSA 8 (confident)" — clear grade, unlikely to be higher or lower
"PSA 8-9 (borderline)" — could go either way at the grading service
"PSA 7-8 (uncertain)" — limited assessment data
Expected: A final grade with confidence level. For BGS, all four subgrades reported. The grade is supported by evidence from Steps 2-4.
On failure: If the assessment is inconclusive (e.g., can't tell if a surface mark is a scratch or dirt), provide a grade range and recommend professional grading. Never assign a confident grade with insufficient data.
Validation Checklist
Bias check completed before grading (no grade anchoring)
Centering measured on both faces with ratios recorded
Surface examined for scratches, print defects, staining, indentations
All four edges and corners individually assessed
Factory vs. handling defects distinguished
Final grade supported by evidence from each sub-assessment