[Jewelry making - Article 00217] - Re: [Orchid] Ruby Vs. Garnet

[The Doctor]

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>     How could you tell if a stone was a ruby or a garnet. I have a few
>     rough stones and we believe they are ruby's, but how can I be sure.

    If you really want to be sure, have a gemologist test it. By the
    general air of your post, I'll assume you don't have any gem testing
    equipment. However, one test you may be able to do is with a
    longwave ultraviolet light (the "black lights" used with posters).
    If the stones in question are rubies, they may (or may not, but
    probably will) glow bright red. Garnets will have no reaction. Keep
    in mind that, even if the stones do have a reaction, they still may
    not be ruby. Red spinel isn't the only red gemstone apart from ruby
    that has a UV reaction. 

James in SoFl

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