MARK RICHARDS-Crystal Stickers: Elements. These stickers are acid free and adhere to virtually any surface. Crystal Elements offers gem stickers in various sizes The assortment stickers include sizes 3mm; 4mm; 5mm and 6mm. These stickers also are available in a variety of shapes; words; designs; alphabets and fashionable colors. Size; color; shape and number of stickers vary by package. Imported.