[Jewelry making - Article 00993] - [Orchid] Brittle Carnelian

[Harry Bagwell]

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    I have heard that most carnelian is heat treated, does anyone know
    precisely how this is done? I'm wondering whether it's done to
    maximize the color without regard for the integrity of the stone. 

    About a year ago, I bought some big rough carnelian cabs of a lovely
    reddish orange. Last weekend I began to cut them, and noticed that
    some had developed meandering hairline cracks. Well, I had intended
    to recut them anyway. 

    The first one cracked when I let it wander onto a dry part of the
    carbide stone for about a second. I cut another one very slowly,
    using finer wheels and it turned out quite lovely. 

    I lost it to the trolls for a while, and they left it underneath a
    closed-bottom filing cabinet that had not been moved for months. I
    cannot explain that part.
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