[Jewelry making - Article 00964] - Re: [Orchid] Black diamond beads

[Far East Gemological Laboratory]

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Hi Micky

    Please take note that many black diamond are treated i.e. irradiated
    to get that black appearance.  As natural black diamond derived its
    blackness from numerous carbon inclusions.  Moreover, it is quite
    difficult to facet black diamond as the crystal orientation make it
    more difficult to cut and polish unlike the gem quality diamond. 

    By the way, if you do jewellery repair on irradiated black diamond,
    please be extra careful, as my research showed, that the heat of the
    jeweller torch will reverse the irradiated black diamond to brown or
    yellowish-brown diamond, their original colour. 

Regards,
Tay
www.gem.com.sg


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