Professional GradingFor Serious Collectors
Expert authentication and certified grading from trusted professionals. No membership fees. Transparent pricing. Multi-grader authentication with industry-leading turnaround times.
Trusted & Certified
Industry-recognized standards and accreditations
The ProfessionalDifference
Industry-leading authentication standards with transparent, collector-focused service.
Multi-Grader Authentication
Two certified graders independently evaluate every card. Discrepancies are resolved by a senior grader, ensuring accurate, unbiased assessment every time.
Transparent Pricing
No hidden fees or mandatory memberships. Simple per-card pricing with volume discounts available. Grading services should be accessible to all collectors.
Industry-Leading Speed
Rush service in 3-5 business days, Express in 7-10 days, Standard in 15-20 days. Professional grading with efficient turnaround times that respect your collection.
Complete Transparency
Every grade includes detailed notes, reference images, and comprehensive grading criteria. Our team provides clear explanations and professional guidance on every submission.
Boise, Idaho Excellence
Proudly based in Boise with a commitment to quality over quantity. Our streamlined operations allow us to offer competitive pricing while maintaining premium service standards.
Collector-Founded
Founded by collectors, for collectors. We understand the value of your investment and provide the professional care your collection deserves at every step.
Our Professional Commitment
If an error occurred, we'll regrade at no charge. Our grades are backed by detailed analysis and industry-standard evaluation criteria. We provide clear, professional explanations for every assessment.
See Our Grading Standards
Examples of cards we've graded across different condition levels
Charizard Base Set
1999 • Pokémon
Gem Mint - Perfect centering, sharp corners, pristine surface
Michael Jordan Rookie
1986 • Basketball
Gem Mint+ - Near-perfect with exceptional eye appeal
Tom Brady Rookie
2000 • Football
Mint - Sharp card with only minor imperfections
Mike Trout Bowman Chrome
2009 • Baseball
Near Mint-Mint+ - Well-centered with minor wear
Wayne Gretzky OPC
1979 • Hockey
Near Mint - Excellent vintage card with typical wear
How It Works
Three steps. No complexity. No surprises. Just honest grading, done right.
Submit Your Cards
Create an account, tell us what cards you're sending, pick your service level, and ship them to our Boise office.
Pro Tip
Use penny sleeves and card savers. We'll ship them back in slabs.
We Grade Them
Two graders independently examine each card for centering, corners, edges, and surface. If they disagree by more than 0.5 grades, a third grader steps in.
Pro Tip
You can add subgrade breakdowns for $5/card if you want the details.
You Get Them Back
Cards are encapsulated in UV-protected slabs with tamper-evident seals. You get a digital certificate with photos and detailed notes.
Pro Tip
Free return shipping on standard. Express and rush get upgraded shipping.
No account required to browse pricing. Sign up only when you’re ready to submit.
Try Our AI Grade Estimator
Get instant grade estimates before you submit. Our AI analyzes your card photos and predicts the grade, helping you make informed decisions.
AI-Powered Analysis
Upload photos and get instant grade estimates
Defect Detection
See exactly what might affect your grade
Cost-Effective
Only 5 credits per analysis - know before you grade
Instant Results
Get your estimate in seconds, not weeks
Upload Card Photos
Front & back images
Confidence: 94%
Centering
9
Corners
9.1
Edges
9.2
Surface
9.3
Trusted by Collectors
Real feedback from collectors who've used our grading services
"GSM gave my 1986 Jordan rookie a 9.5 when PSA said it was an 8. Got it regraded by BGS and they confirmed 9.5. These guys know what they're doing."
Marcus Thompson
Vintage Collector
"Finally, a grading company that understands TCG cards! The subgrades helped me understand exactly why my Charizard got a 9 instead of a 10. Super transparent process."
Sarah Chen
Pokémon Enthusiast
"I've used every major grading company. GSM's turnaround times are unbeatable and their prices are fair. No membership fees is a game changer for my business."
David Rodriguez
Sports Card Dealer
"As someone new to grading, I appreciated how GSM explained everything. The AI estimator helped me decide which cards were worth grading. Saved me a lot of money!"
Emily Watson
New Collector
"Sent in my Black Lotus and was nervous the whole time. GSM kept me updated at every step, and the final grade was exactly what I expected. Highly recommend."
James Park
MTG Player
"Fast, affordable, and accurate. What else do you need? My Gretzky rookie came back in 10 days with a grade that matched my expectations. Will use again."
Rachel Kim
Hockey Card Collector