DIESE Custom Guitars is a French workshop based in Dombasle-sur-Meurthe that specializes in guitar customization, with a particular focus on handcrafted engraved steel pickguards. Working under the tagline "we make rock n' roll guitars for rock n' roll people," the shop produces made-to-order pickguards built around client-chosen themes — bands, films, video games, comics, and other pop-culture imagery — alongside personalized illustrations and artisanal finishes.

The workshop offers pickguard templates covering a wide range of popular electric guitar and bass bodies, including Fender and Squier models (Telecaster, Stratocaster, Jaguar, Jazzmaster, Mustang, Bronco), Gibson and Epiphone shapes (Les Paul, SG, ES, Explorer, Flying V, Firebird), and instruments from Ibanez, ESP, and LTD. Beyond pickguards, DIESE also undertakes full guitar customization and accessory work, positioning itself as a boutique operation aimed at players who want visually distinctive, one-off instruments rather than off-the-shelf gear.