Bohemian crystal is a type of glass with a significant amount of lead oxide, as clear as rock crystal that produces a high quality crystal. In the course of the second half of the 14th century, the oldest Czech glassworks were manufacturing nearly pure crystal, with yellow and green reflections, as well as colored glass, very popular during the Renaissance. Bohemia excelled in crystal manufacturing particularly in the 18^th century through the creativity and the high-level qualification of the workers, leaving in the shade Venetian glassmakers who until then were unrivalled. Many of them came in Western Europe and brought their technics.