Boiling your glass products is not recommended because that would jeopardize the embedded crystal element and glass medallion
There are companies that say you can warm your glass in the microwave or cool it in the freezer. We, however, do not recommend either of these methods for your safety! The microwave will heat unevenly and could cause severe burns and the freezer, well, have you ever gotten your tongue stuck on a piece of ice? OUCH! Glass is easy to heat up or cool down simply using running water to adjust the temperature.