Handwash recommend. Do not use in the microwave. Crystal, Glass and Porcelain should be hand washed separately in warm soapy water, rinsed thoroughly and dried with a soft cloth. The finely made rims are the most fragile part of your product. Do not turn upside down while drying or storing. Stemware should be held by the stem in order to avoid stress on the bowl of a piece. Users should take care not to pour extremely hot or extremely cold liquids directly into glassware, as this can cause breakage or cracking.