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New Standards of Excellence in the Mineral Kingdom - M.R. March-April 2014
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alfredo
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PostPosted: Apr 20, 2015 10:29    Post subject: Re: New Standards of Excellence in the Mineral Kingdom - M.R. March-April 2014  

Bob, Heat treatment of tanzanites varies with the point of view: always natural, if you're selling; heat treated, if you're buying ;))
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bob kerr




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PostPosted: Apr 20, 2015 10:51    Post subject: Re: New Standards of Excellence in the Mineral Kingdom - M.R. March-April 2014  

alfredo wrote:
Bob, Heat treatment of tanzanites varies with the point of view: always natural, if you're selling; heat treated, if you're buying ;))


good point!

it's just that it seems to me that these are mainly marketed for cutting/jewelry and in that market color is everything and what matter does it make where the color comes from. it spills over to the specimen trade without any real regard for the truth.

I do like them though and have a few in my display collection - usually get the immediate eye of any viewer!

bob
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