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 includes publications such as The Overstreet Comic Book Grading Guide, The Big Big Overstreet Comic Book Price Guide, The Official Price Guide to Pop Culture: 150 Years of Character Toys & Collectibles, and Hake's Price Guide To Character Toys. Past publications include such titles as 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 Comic Book Marketplace, The Overstreet Comics Price Review, Overstreet's Fan, The Overstreet Comic Book Monthly, and Overstreet's Gold and Silver Age Quarterly. 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.