Our Story

As a small group of casual collectors, we struggled to find affordable, professional services that didn't require us to wait 6 months to get our collectibles returned. With that, Sigma Card Grading was born.

We've focused on scaling Sigma slowly. After grading over 10,000 cards locally, we finally decided that it was time to expand nationally. Based in Michigan- we focus on high quality grading services with quick turnaround times and beautiful slabs meant to display.

What's different about Sigma Card Grading?

As a fully self-funded organization, we care foremost about keeping our promises. We've been personally burned by basement grading companies who don't prioritize customer experience or have the funds to keep afloat. We're committed to doing the right thing and doing it sustainably- for the love of the hobby.

Are you going to charge me based on the grade? What's included in the list price?

Absolutely not- the price you see is the price you pay. We'll never hit you with an upcharge based on your grade because we think that's crazy.

For $8 per card (or $10 with a bumper) you get:
-AI supported, human verified grading
-Your card preserved in a beautiful, ultrasonic welded slab
-Return shipping to you in the continental US at no additional cost

What happens after I pay?

1. You ship your cards to Sigma:
Sigma Card Grading
901 S. Bridge St. #256
Dewitt, MI 48820

2. Add your card details to your order at app.sigmacardgrading.com

3. Within about 10 days after receipt, your graded cards are sent back in the mail to you!

Should I choose you over PSA/CGC/TAG...etc?

That depends. If you have rare, highly valuable cards or you're looking for the autograph authentication that PSA provides, we're probably not the best choice for you. 
However, if you're looking for quality, accurate grading services at affordable prices- and getting your cards back in your hands quickly- we like to think we're tough to beat.