Who we are

Cornerstone Cards is an online store for authenticated and collectible trading cards and related memorabilia, operated by Cornerstone Cards and based in Chicago, Illinois.

We specialize in sports and trading cards — including raw (ungraded) cards and professionally graded or authenticated items from companies such as PSA, BGS, SGC, CGC, and others — as well as select sports and entertainment memorabilia.

How Cornerstone Cards works

Cornerstone Cards operates as a marketplace-style store. Listings on cornerstonecards.shop come from approved sellers in our network. When you place an order, Cornerstone Cards processes your payment and order through our checkout; the listing seller then fulfills and ships the item to you.

That means the exact card pictured and described in a listing is the card being sold from that seller's inventory — not a generic stock photo for a type of card. Availability can change quickly for one-of-a-kind collectibles; if an item sells out or is withdrawn, it is removed from the store and can no longer be purchased.

Our relationship with Mascot

Cornerstone Cards is powered by marketplace technology and seller-network infrastructure from Mascot (withmascot.com). Cornerstone Cards is the merchant of record for purchases made on this site. Mascot provides the platform that helps us list inventory from approved sellers, process orders, and operate the storefront.

If you see references to Mascot in payment descriptors, platform notices, or related business records, that reflects this technology and network partnership — not a different store selling you a different product.

Authenticity and condition

We take authenticity and accurate descriptions seriously. Graded or third-party-authenticated items carry the certification of their grading or authentication company. Listing photos and descriptions are intended to show the specific item you will receive. Condition and eye appeal can be subjective; please review photos carefully before purchasing.

Customer support

Questions about an order, a listing, or our policies? Visit our Contact Us page or email us at support@cornerstonecards.shop. Support hours: Monday–Friday, 9:00 AM – 5:00 PM Central Time. We typically respond within 1–2 business days.