There are several ways someone can tell real crystal from glass, including determining the weight. Crystal weighs more than glass, so if the object is heavier, it is likely crystal.Continue Reading
Crystal also produces a musical tone, where glass does not. Users can test this in one of two ways.
Wet a finger and run it around the rim of a crystal glass. If the glass is crystal, it will produce a tone.
Lightly tap the glass with a spoon. If the spoon produces a musical ring, it is most likely crystal.