Gemmr predicts what PSA, CGC, BGS, SGC, and TAG would each return on your card — raw or already-slabbed — across the same four pillars every grader uses. So you know before you ship, before you pay, and before a 9.5 you were sure was a 10 costs you the resubmission fee.
Four stages, each doing one thing well. Each stage's output feeds the next so a confident answer earlier means a faster, cheaper answer overall.
Before we charge you for the scan, a fast vision model checks the image for the things that would ruin a grade: blur, glare, partial card, multiple cards in frame, or just — not a card. If anything fails, your Gems get refunded automatically. We never pretend to grade an unreadable photo.
For graded slabs from PSA, BGS, CGC, SGC, or TAG, we detect the label region, extract its metadata (service, grade, cert, card name), and then crop those pixels out of the image before grading begins. The grader physically cannot read the label. This is what lets us honestly predict — we're not reading the grade and rounding.
We identify what you've sent us — card name, set, year, and printed number. This becomes context for the grader (cards from different eras have different print quality baselines) and shows up in your report so you can reference it later. Skipped for slabs where the label already provided all this.
The grader analyzes the card across centering, corners, edges, and surface — the same four dimensions PSA, CGC, BGS, SGC, and TAG use internally. For each pillar we return a sub-grade, a confidence level, and notes on what we saw. Then we synthesize those into per-service predictions, because graders weight the pillars differently.
The grading criteria are the same ones every major service uses. The difference is how each service weights them — which is what makes one card a PSA 9 and a CGC 9.5 at the same time.
Measured as left/right and top/bottom border percentages. Heavy centering offsets are the most common reason a clean-looking card gets a 9 instead of a 10.
We assess each corner separately: clean, minor wear, whitening, or damaged. Whitening on a black-bordered card is the silent killer of a perfect grade.
Edges are graded on a four-level scale: clean → minor wear → wear → damaged. Edge wear is what most graders notice first when the card comes out of the binder.
The hardest pillar to judge from a photo because lighting matters. We flag what we can see and tell you what we can't — better honest uncertainty than false confidence.
Cards rarely grade identically across services. Gemmr predicts all five because the question 'should I submit?' depends on which service you'd submit to — and which gives you the best return for your fee.
Most recognized brand. Strict on centering and surface.
Fast turnaround. Slightly more generous on edges than PSA.
Sub-grades for each pillar. Toughest on centering.
Vintage-focused. Often grades half a point higher on older cards.
Granular. AI-assisted. Returns sub-grades down to the integer.
Every scan returns a full report you can reference, share, and save as a PDF.
One predicted grade per service, each with a confidence range. So you can see 'PSA 9 (likely)' next to 'CGC 9.5 (possible)' on the same card.
Each pillar's sub-grade, the specific notes the grader wrote, and a confidence level. You can see exactly why the verdict landed where it did.
The bottom-line question, answered. We tell you whether the math says this card is worth the grading fee.
For PSA slabs, we pull the live population count from PSA's public database, so you can see how rare your grade actually is.
Every report has its own URL with optional summary or full detail view, ready to drop into a sales listing or send to a buyer.
Paid plans get a watermark-free PDF you can save, print, or attach to a marketplace listing.
What collectors actually ask when they hear 'AI grading.'
Start free. 75 Gems per month — about 7 grade scans, 10 centering checks, 75 price checks, or any mix. No credit card.