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Black Agate vs Onyx: Know the Difference

By:  Myra S.

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Black Agate vs Onyx Know the Difference

Who doesn’t love the mysterious allure of a black jewel? We certainly do! That said, differentiating between similar looking gems like black agate and onyx can be difficult.

If you find yourself agreeing with the above, you’re in the right place.

Join us as we look at black agate and onyx and highlight the key differences between the two.

Black-Agate-vs-Onyx

Black Agate vs Black Onyx: What is the Difference?

1) Definition

Black Agate: A variety of chalcedony, the black agate is one of the lesser-known jewels out there. It looks quite similar to its black onyx counterpart and is often mistaken for one. That said, the gemstone does differ in several aspects and is worthy of investment in its own right.

Black Onyx: Another variety of chalcedony, the black onyx is a far more famous gemstone. It is prized worldwide for its translucent to opaque surface and is a fantastic option for those who want to flaunt a jewel that looks unique.

2) Line Structure

Black agate: This gem typically has several unstructured lines that run along the length of its body. These lines are often curved and can even appear in a circular fashion.

Black onyx: Generally speaking, the majority of black onyxes used in fine jewelry designs do not have lines. However, in the rare instances where they do, the same is typically presented in a straight and structured manner.

3)Luster

Black agate: This gemstone features a unique glass-like luster that sets it apart from the rest.

Black onyx: On the other hand, the black onyx’s luster is defined by its waxy nature.

4) Symbolism 

Black agate: The jewel symbolizes stability, resilience, courage and prosperity.

Black onyx: On the flip side, this gemstone represents positivity, decisiveness and strength.

Now that you know the differences between black agate and black onyx, let’s discuss some rarely known facts about the two.

Did you know?

  • The king of Pontus (Mithradates) was so obsessed with the gemstone that he actually commissioned the creation of 3000 black agate bowls.
  • Cleopatra would often wear black onyx jewelry to protect herself from harm. According to the story, the stone would vibrate and alert the queen when she was in danger.

Also Read: Black Onyx Meaning & Symbolism

Black Agate Vs Onyx FAQs

  • Black agate vs onyx: Which is more durable?
    Both, the black agate and black onyx feature a rating of 6.5-7 on the Mohs scale of mineral hardness.
  • Is the black agate a protective gem?
    While there is no scientific evidence to support the same, many individuals believe that wearing the black agate will protect them from danger.
  • Is the black onyx a precious gem?
    The black onyx is a semi-precious gemstone. As of today, there are only 4 precious jewels present in the market. They are as follows:
    • Diamond
    • Ruby
    • Sapphire
    • Emerald
  • Is the black agate a birthstone?
    No, it is not! Having said that, during ancient times, this jewel was known as the May birthstone. However, it was eventually replaced by the Emerald. Still if you connect to the gemstone, you can buy an onyx stone ring for yourself.

Comment (1)

  1. Chiquita 09/02/24

    Great article! Clear and concise explanation on the difference between black agate and onyx. Really helped me understand which one to choose for my jewelry collection. Thanks, Angara!

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