Double Diamond Onlay Mold by Marvelous Molds. This Double Diamond Silicone Onlay Ribbon is the perfect tool to create raised, 3D diamond motifs for cake decorating. While designed for fondant covered cakes, Onlays can be used on buttercream cakes provided the cake is thoroughly refrigerated prior to application. Apply the Onlay while the buttercream is firm and cold, using piping gel or edible glue. This design is effective as a border and measures approximately 6-1/4 x 3/4 inches.MARVELOUS MOLDS