Dear Members
I have been concerned for a while about the amount of treated welo opal being passed off as natural black opal.There are thousands wrongly listed on the internet but they are also being sold in Australian retail shops and even on the opal fields. I asked Natassa Patel a honors graduate from the AIGS school in Bangkok to research on how to tell if the stone is natural or treated if you are on the field and DONT have access to laboratory testing equipment. I welcome your feed back as to how easy you found it to understand? Please find enclosed the attached
final natural vs dyed opal[48856]
Kind Regards
Paul Sedawie
President of the Opal Association