Le Creuset Stoneware Berry Jam Jar in Cherry Red. Le Creuset Poterie Stoneware is fired at 2160 degrees F, giving it unmatched strength and durability, and making it resistant to chipping, cracking and staining. The enameled surface makes it easy to clean and scratch resistant. Le Creuset stoneware won't absorb odors or flavors. For more than 80 years, Le Creuset has been an inspiration to professional chefs and home cooks alike. Microwave, oven, and dishwasher safe.