The plate has a diameter of approximately 12.3 cm, and the cup has a diameter of approximately 7.3 cm. Please allow for some margin of error as these measurements are approximate. The plate has fine crackling throughout. Also, as shown in photo 7, there is a small scratch, which is a little difficult to see. I have always displayed these in my cupboard because I love the blue color. I am selling them to declutter my home.