Pate-de-cristal is accomplished my making a negative mold of the artist’s original sculpture then introducing fragments of colored crystal. The mold is then fired for at least 10 days and then broken, revealing the pate-de-cristal sculpture. Since each mold is broken, every piece of Daum is truly a one-of-a-kind work of art. The distinctive bubbles seen in each piece are completely normal and are referred to as a “champagne effect.”