In general, dinnerware that is made of glass, ceramic, porcelain, or stoneware is microwave safe. However, there are a few exceptions. For instance, some types of glass dinnerware can become cracked or shattered when heated in the microwave. Additionally, certain kinds of glazes on ceramic or porcelain dinnerware may not be microwave safe. Therefore, it's always best to check the manufacturer's instructions before using any type of dinnerware in the microwave.