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  1. The diamond led will actually illuminate if it was reading as a diamond, the "sensitivity" is actually just volume for the built in speaker, anything sapphire will read up to the 8 mark. We use similar Diamond testers in the jewelry business, a tad more high tech ones but they all operate very similar.

  2. JerryRig's testing is way better tho, using Mohs picks makes more sense because it's supposedly unscratchable; pure sapphire or not, Apple marketed it as as more scratch resistant, but his test found that Apple actually uses very little sapphire on their devices and mix them with glass, making it just as scratchable as normal tempered glass.

  3. People ,people lets buy real watches …whats with this bull shit apple watches every freaking blogger has. Its embarrassing to the real watch collectors ….and yes i saw that tissot . Nice

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