Forums Cutting Material and Identification Heliodor color change?

  • Heliodor color change?

    Posted by tylartidden on September 18, 2019 at 7:23 pm

    A week or so back I received some mid-quality heliodor rough. It was a nice golden color, and was relatively flawless internally (it had some minor inclusions). I intended on cutting it into a “Sugarloaf cut” to practice. As I was processing my material, I noticed the golden color faded and the stones are now a very light blueish green. What caused this? Does heliodor change color easily? I have pictures from after the color change happened, but not before sadly.

    Lowjiber replied 4 years, 10 months ago 3 Members · 2 Replies
  • 2 Replies
  • brellan217

    Member
    September 18, 2019 at 10:51 pm

    I’ve never heard of heliodor turning that color. Did you buy it from a reputable source? Maybe try to identify the material using a specific gravity test?

  • Lowjiber

    Member
    September 19, 2019 at 12:44 am

    I’ve only seen one piece of Heliodor cut and it was indeed yello/golden as you described above. That said, Heliodor is really in the Beryl family, and Beryl is heat sensitive… But that shouldn’t be the cause of your color change.

    I did find this quote on-line: “Originally the term “Heliodor” was coined as a trade name for greenish yellow Beryls from Namibia. Today it is widely used to describe all yellow or greenish yellow Beryls.”

    Here’s the source: https://www.edelsteine.at/en/glossaries/lexicon/beryl/

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