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How to Tell Crystal From Glass

To the untrained eye, glass and crystal look nearly identical. If you are interested in purchasing something that you believe is crystal, it is important to know for sure that it actually is crystal so you get a fair price. Due to the differences in chemical makeup of crystal and glass, there are distinct differences that make it easy to tell them apart. With a little practice, you'll be able to tell the difference between glass and crystal in a matter of seconds.

Instructions

- 1
  Check the thickness of the item. Glass is generally thinner due to a glass blower's ability to blow it extremely thin.
- 2
  Compare the item to a glass item that is roughly the same size. Crystal is much heavier than glass due to its high metal content. While this isn't a foolproof method, it can still help you determine whether it is glass or crystal.
- 3
  Examine the cuts on the item. Glass often has sharp cuts, while crystal has smooth, rounded cuts.
- 4
  Hold the item up to the light. Glass typically has a yellow or green tint, while crystal is completely clear. Crystal also produces more of a colorful prism effect than glass.
- 5
  Tap the item and take note of the sound it makes. Glass usually has more of a dull thud, and crystal has more of a high-pitched chime.

Rocks & Minerals