[Jewelry making - Article 00591] - [Orchid] A dark stain on a gold ring

[akash I lotan]

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    Namaste everybody 

    A year and a half ago I made an Opal ring. [It is fabricated,] the
    gold is 18k body and 22k bezel. [both Rose] A black stain become
    apparent a few months after the ring was made, and  shortly after a
    lady had bought it. She wore it constantly.  A month after the ring
    was sold, I took it back and tried to fix the problem. I scrubbed the
    dark layer out. Removed the little diamond and reset it. had a good
    look with a 50x microscope, but couldn't see any crack or pore! 

    My guess is that some dirt created a bubble in the original ingot,
    that contained the black substance. under the rolling mill it has
    become invisible, but still there must be an hidden cavity containing
    a certain volume of the black stuff.. as it has been cleaned out a
    number of times, and still continue to ooze through its invisible
    "spring". Hard scrubbing does temporarily remove the stain. [Because
    of the opal I have not yet tried to clean it in the ultrasonic.] 

    I've uploaded a page with a large photo of the ring with the stain,
    its on this page: 

    http://www.akashjewels.com/ringWithStain.htm 

    can anyone suggest an explanation to this uncomfortable stain? And
    what can be done to repair this ring? The lady loves here ring. For
    my self, I really can't afford scraping this one ring and having to
    make her a new one... which I will  do if all repairs failed . 

Thank you all very much
akash


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