Opal cup and saucer 1.opal cup 2.heat resistant opal glass 3.microwave safe, dish washer safe, break resistant. Opal cup and saucer1 ... which is made from natural silicon and high quality chemical which are melted, cooled down and then solidified as non-crystal inorganisn ... Glass cups, Goblet, Champagne glass, Beer mug, Whiskey Cup, Wine Cup, Martini glasses, Glass fruit plate, Drinking glasses, Frosted ...