[Jewelry making - Article 00152] - Re: [Orchid] Ruby Vs. Garnet

[Greg DeMark]

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Monika,

    Do you have Gem testing equipment?  If so, first start off with a
    Polariscope to determine if the stone is a single or doubly
    refractive material ( Single refraction : Garnet & Double
    Refraction: Corundum) 

    Next use a Refractometer to determine the Refractive Index ( Garnet:
    from a low of approximately 1.72 up to a high of approximately 1.875
    depending on the type and Corundum: 1.762 - 1.770 ( -.003,+.008) ). 

    Next you can do a specific gravity test ( Garnet range: 3.61 to 4.15
    depending on type & Corundum: 4.00 (+ or - .03) ) 

    And finally you can examine the stone for inclusions but that is too
    detailed for me to explain here. Pick up a good book that has photos
    of the inclusions or a good explanation such as The Handbook of Gem
    Identification by Richard T. Liddicoat, Jr. 

<edit>

    Handbook of gem identification
    By Richard T Liddicoat
    http://www.ganoksin.com/jewelry-books/us/product/0873110064.htm

</edit>

    If you do not have experience as a Gemologist it may be best to
    consult one. 

Good Luck
Greg DeMark
email: greg AT demarkjewelry.com
Website: www.demarkjewelry.com
Custom Jewelry - Handmade Jewelry - Antique Jewelry

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