[Jewelry making - Article 00240] - Re: [Orchid] Repairing a ring of stones

[Michael R. Mathews Sr.]

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Hello Sandra:

    According to my GIA gem ref. guide Star sapphire shouldn't be heated
    above 1600C and rapidly cooled as it may change the color
    permanently. If it is an oiled stone, it shouldn't be heated at all.
    I cracked a blue star sapphire with my torch 7 years ago and it has
    made me wonder about the safety of heating them so I don't. Best you
    find someone with a laser welder to do the repair. 

Michael R. Mathews Sr.

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