[Jewelry making - Article 00097] - [Orchid] Dark stain on gold?

[akashjewels]

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    Dear Orchidians In one ring I made a few months ago... A very strange,
    and disturbingly mysterious dark 'pach', keeps re-appearing at a
    small area on the gold surface....! It is to me a  phenomena I  never
     encountered before? The piece is a 20k rose gold ring. with Opal and
    diamonds, and because of the Opal, I have not tried to clean the
    stain in the Ultrasonic. yet It come off with a rotary brush and
    plain spit. And... When the lady who bought the ring, ware it, the
    stain is beck within a day or two. Now [after it came back for
    cleaning for the forth time.] I kept the ring in the studio, and the
    stain hasn't come back... yet! [ 4 days] my guess here is that while
    its being worn, the heat, activate the....? mysterious black thing,
    But I have no idea where it may be oozing from... I've been digging
    in to the gold looking for a pore or hidden pit, but under a 50x!
    microscope I can find no clue. there is a seam, just next to that
    area, where the bezel is soldered to the body of the ring. yet the
    seam looks perfect. 

    Please.... any ideas,is there any thing I could try to do...?  has
    any one ever equator a similar problem? The lady is leaving in a
    week. I must solve this one... Love & Light. akash 
    www.akashjewels.com

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