Best known as the home of The Overstreet Comic Book Price Guide, Gemstone Publishing, a division of Geppi's Entertainment Publishing & Auctions, was formed by Diamond Comic Distributors President and Chief Executive Officer Stephen A. Geppi as a conduit for his efforts in preserving and promoting the history of the comics medium.
Gemstone's product line also includes recurring publications such as The Big Big Overstreet Comic Book Price Guide, Overstreet's Comic Book Marketplace Yearbook, The Official Price Guide to Pop Culture: 150 Years of Character Toys & Collectibles, and a variety of special editions such as The Overstreet Guide to Grading Comics, The Overstreet Guide to Collecting Comics, and The Overstreet Guide to Collecting Comic and Animation Art.
Past publications include such titles as The Overstreet Comic Book Grading Guide, Hake's Price Guide To Character Toys, The Official Price Guide to Disney Collectibles, The Official Price Guide to Mechanical Banks and The Overstreet Indian Arrowheads Identification and Price Guide, as well as periodicals including Comic Book Marketplace, The Overstreet Comics Price Review, Overstreet's Fan, The Overstreet Comic Book Monthly, and Overstreet's Gold and Silver Age Quarterly. Back issues of many of these titles are available for sale on the Gemstone website. Gemstone also published Disney comic books under license from 2003 through 2008.
Gemstone also publishes Scoop, a free weekly e-newsletter which looks inside the world of pop culture with a focus on auctions, toys, comics, posters, art and anything and everything pop culture! The spotlight is on fun, while also offering informative insights into the beloved playthings of the past and how they have influenced our culture.