[Jewelry making - Article 00552] - Re: [Orchid] Sun spangled inclusions in natural amber

[Alain van Acker]

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Hi,

    The GIA response seems to match what Kurt Nassau wrote about it in
    "Gemstone Enhancement" (1984). 

    The discoids form when the heattreatment, either in rapeseed oil or
    without oil, is followed by a too fast cooling down (not quenching). 

Alain

 
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