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How to Tell If Your Black Onyx Is Real: Expert Authenticity Tests

Learn how to identify genuine black onyx using simple scratch, color, and light tests. Find out when to consult a gemologist for verification.

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Video transcript

Test for authenticity of your black onyx by performing the scratch test with a sharp object; real onyx won't scratch easily. Check the color: real onyx should have a consistent deep black hue, often with a waxy luster. You can also try the light test: shine a light through the stone; genuine onyx should not allow light to pass through. For greater assurance, consult a professional gemologist.

Questions and answers

  1. What is the best way to test if black onyx is real?

    The best way is to perform a scratch test, check the color for a consistent deep black with a waxy luster, and use a light test to ensure no light passes through. For conclusive results, consult a professional gemologist.

  2. Can black onyx be scratched easily?

    No, real black onyx is relatively hard and should not scratch easily with a sharp object.

  3. Why does black onyx appear solid black in color?

    Genuine black onyx typically features a consistent deep black hue and a waxy luster without translucency, distinguishing it from imitators.

  4. When should I see a gemologist to verify my black onyx?

    If you are uncertain after performing home tests or if the stone is valuable, consulting a professional gemologist is recommended for accurate verification.

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