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gemology: Topaz or Sapphire?
how can you tell if you have a pink topaz or a pink sapphire?
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Sapphire is harder than topaz, a 9 vs. an 8 on the Mohs hardness scale. The problem with testing it that way is that you'd need a known sample an 8-hardness mineral to try and scratch with it, which you probably don't have; minerals harder than 7 tend to be rare gemstones.
Take it to a jeweler. They can examine it closely and measure such properties as its light refraction and such, and make a positive identification.
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