[Jewelry making - Article 00372] - Re: [Orchid] Diamond cutting

[Jim]

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Hi Noel,

    Diamonds can be shaped and reduced in size by "cleaving". Almost all
    very large rough diamonds will be roughly shaped by cleaving. Regular
    size rough will be processed by sawing. Today sawing will utilize
    either a mechanical saw or a laser. Both methods of sawing will
    result in some waste of the rough material. Cleaving, when done
    properly, results in almost no wasted material. 

    Cleaving is done using a thin steel "iron". The iron is struck a
    solid blow and the rough diamond is split along a cleavage plane. The
    diamond is examined to ascertain how the cleavage planes are
    orientated. A groove is created on the surface which follows the
    cleavage plane to prevent the iron from slipping. This is the process
    which was done in the back seat of a moving car several years ago. I
    think that was shown in a commercial done by Ford. All of the
    subsequent steps in the polishing of a diamond are done by grinding. 

Jim miller

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