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Its their name for "hardlex", that's all. Scratch resistant mineral glass.I've been browsing at Orient's online site. Some watches uses "Crystal Glass". Is this scratch resistant? How is this compared to mineral or sapphire? Here's one of the watch who uses it:
http://www.orientwatchusa.com/watch.php?id=108
Hardlex: Gets scratches easier but provides better shatter resistance
Sapphire: Provides better resistance against scratches but has diminished resistance against shattering.
Hope this helps!