1. plain glass, Crystal, not glass but with a mixture of Lead Oxide, 24% up if there are 24% Lead Oxide is not to be deemed to be a Crystal or glass grinding according to European standards.
1. Non-conventional glass crystal But the glass with a mixture of Lead Oxide 24% or more if less than 24% Lead Oxide is not considered crystal. Or Crystal By European standards
1. Crystal is not the ordinary glass. But as the glass with a mixture of Lead Oxide 24% up if there is less than 24% Lead Oxide will no longer be a crystal หรือแก้ว cut by European standards.