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Discussion Starter · #1 ·
How can you tell if a watch has an acrylic or glass crystal fitted?
I recently wasted a lot of elbow grease and toothpaste trying to polish a glass crystal because I was misled into believing it was acrylic. I then broke it pushing on it lightly - lucky I didn't slash my thumb. Yes I'm a noob:(
 

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If it's cold it's likely crystal. The other easy way to tell is to put your front teeth on the crystal and slide across the surface, the difference will be very obvious between the two.
 

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A drop of water will tell the differences.
There are a number of posts on the old forum with regard to using a water test to distinguish sapphire, hardlex, mineral and acylic - unfortunately it can't be relied on due to very differing results.
The state of polish, coatings and even variations in the water itself can cause so many variations that it's not a definitive or reliable test.
 
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