What is the difference between glass and crystal?

This is a question we receive quite frequently and is a hard question to answer.  The truth is that all crystal is glass, but not all glass is crystal.  In fact, some glass is considered crystal in some parts of the world and the same piece in other parts of the world is not.  Confused yet?  The best way to explain the difference is if glass has a certain percentage of lead oxide content it can be considered crystal.  In the United States, if a piece ...
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