[Jewelry making - Article 00003] - Re: [Orchid] Fire opal question

[Peter W . Rowe]

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>        was wondering if fire opals always go opaque in sunlight? or am
>     I mistaken about the type of stones I have? Anyone else have this
>     experience? 

    While the type of lighting hitting a stone may change the way it
    looks, it seldom changes the actual optical properties of the stone. 
    I don't think I've ever seen an opal of any kind that changed it's
    degree of transparency in sunlight versus some other light source. 
    Differing light sources may change apparent intensities of colors,
    and stones may appear radically different when lit from behind
    instead of from the front, or with diffuse light instead of a point
    source like sunlight.  But the opacity/transparency?  That shouldn't
    change.  What does your stone look like? 


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