[Jewelry making - Article 00153] - [Orchid] Material adhering to gemstones

[Jeffrey]

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    Over the years I have noticed when cleaning customers jewelry that on
    occasion I will get a sapphire or emerald that has collected a film
    on its surface that defies normal cleaning practices. The film has a
    look similar to an oil slick on water. Tripoli polishing compound
    will remove it and it does no apparent harm to the gemstone. What
    ever the material is that the client is coming in contact with is
    very tenacious and seems to effect only specific gems. I have not
    been able to find a commonality among my customers that would
    indicate what would cause it. Has anyone else experienced this or
    would know the cause? Any help would be appreciated. 

Jeffrey
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