Dark Blue Gemstone Studded Internal Ring Large Size 22mm Backplate for Large Size Floating Lockets - Fits Old School Geekery TM Brand Lockets and Other Brands Large Size Locket Backplates - 22mm External Diameter Fits Old School Geekery TM Brand Large Size Lockets Will fit many other brands of lockets, you can measure the internal width of the locket, locket must be 22mm or more on the inside Each Backplate Comes with a Reusable Cardboard Jewelry Gift Box