[Jewelry making - Article 00970] - Re: [Orchid] Glass-filled rubies

[Jerry in Kodiak]

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>     What actually happens is the flux used to protect the stone during
>     the heat treatment melts and enters the cavity. This problem is
>     most often found in rubies but could be found in other gemstones as
>     well due to the process used. 

    Well yes, that's pretty much true as far as it goes, but the
    treatment is not simply an unintended consequence of ordinary heat
    treatment but, at least in the case of Mong Hsu ruby, a process
    intentionally used to improve the appearence of  lower qulity,
    fracture filled stones. There is a detailed discussion by Richard
    Hughes at: 

    http://www.ganoksin.com/borisat/nenam/ruby1.htm 

Jerry in Kodiak

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