Schott Zwiesel Crystal Glass is made from a formula that replaces lead with zirconium and titanium for brilliance and strength. Schott Zwiesel Crystal Glass is unrivaled for the elegance of its design yet it is dishwasher safe. International Buyers - Please Note. These charges are the buyers responsibility. We do not mark merchandise values below value or mark items as gifts - US and International government regulations prohibit such behavior.