Opal oval plate 1.8'-14' opal oval plate 2.heat resistant opal glass 3.microwave safe, dish washer safe, break resistant. Opal oval plate1.8'-14' opal oval plate2.heat resistant opal glass 3.microwave safe, dish washer safe, break resistant. Opal glassware which is made from natural silicon and high quality chemical which are melted, cooled down and then solidified as non-crystal inorganisn. The ...