The Tovolo Faceted Diamond Craft Ice Molds Set of 2 freeze two large 2.5-inch diamonds with many precisely molded facets. The facets catch and refract light at every angle, giving the ice a jewel-like look in a rocks glass or tumbler. Large ice melts more slowly than standard cubes, so whiskey, bourbon, Scotch and cocktails stay cold without watering down. Fill each mold with water to the fill line, seal it with the silicone cap and freeze for 4 to 6 hours. The tight-fitting caps are leak-free, will not tip in the freezer and prevent spills, and the molds stack vertically to save shelf space. Each mold measures 5.1 by 3.74 by 5.98 inches. The clear molds with capri blue silicone caps release each diamond cleanly, are BPA-free and dishwasher safe and make a romantic gift.