[Jewelry making - Article 00223] - Re: [Orchid] Drilling holes in pearls

[andy cooperman]

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    I've always thought that the spade type of pearl bit was used to
    seat half pearls (cabochons, if you will) in settings such as around
    cameos,etc. That explained to me the relatively large size the bits
    range up to: much larger than a hole you would need in a pearl. 

    The bits left a "hole' with walls perpendicular to a flat floor.
    When I've dismantled old jewelry with these half pearls, the floor of
    the hole had a little pilot mark at the center left, in my eyes, by
    the center guide on the spade bit. 

Andy
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