The Tovolo Heart and Diamond Ice Molds Set of 4 makes two large heart-shaped cubes and two faceted diamond cubes, so the ice becomes part of the presentation. The shapes suit whiskey, bourbon, champagne and craft cocktails. Large-format ice chills a drink quickly and melts more slowly than small cubes, which keeps the flavor from watering down. Fill each mold with water to the fill line, cover it with the tight-fitting lid and freeze for 4 to 6 hours. The lids prevent freezer spills, seal out odors and let the molds stack neatly on a shelf. Flexible BPA-free silicone releases the detailed shapes without cracking or breaking. The molds are dishwasher safe for quick cleanup. The heart and diamond shapes fit anniversaries, Valentine's Day, weddings and date nights.