Porcelain Is Fired at Higher Temperatures Than Stoneware
Because stoneware and porcelain use different types of clay, they also have different firing temperatures. According to Clay Times, stoneware is fired at about 2,100 degrees to 2,372 degrees Fahrenheit. Porcelain, on the other hand, is fired at temperatures above 2,300 degrees Fahrenheit. Because of the high firing temperature, both of these materials handle heat well when you use them. Depending on the glazes and decorations, they may both be dishwasher safe.

Stoneware Is Heavier Than Porcelain
Weight is an important thing to note when considering whether an item is stoneware vs. porcelain. Stoneware is always heavier than porcelain, since the clay used to make it is courser. If you lift a stoneware tea cup and a porcelain tea cup, you will notice the porcelain cup is lighter. You can easily notice this if you have a lot of experience with both materials, but even a novice collector can compare the weights of two similar items in a shop.