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20 Jan-02:00:25 Re: collecting focuses and how they can change (Andreas Gerstenberg)
19 Jan-23:46:36 Re: a bit on the economics of being a mineral dealer (Bob Kerr)
19 Jan-23:26:28 Re: help with mineral found, san rocendo canyon, mexico (Peter Megaw)
19 Jan-23:17:14 Help with mineral found, san rocendo canyon, mexico (Yazzyenna)
19 Jan-18:13:19 Re: collecting focuses and how they can change (Don Lum)
19 Jan-15:08:21 Re: a bit on the economics of being a mineral dealer (Pierre Joubert)
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19 Jan-13:56:49 Re: favourite fluorites? (Tobi)
19 Jan-13:39:16 Re: a bit on the economics of being a mineral dealer (Peter Lemkin)
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19 Jan-12:26:51 Re: locality for this probable natrolite (?) specimen? (John Medici)
19 Jan-12:13:41 Re: a bit on the economics of being a mineral dealer (Pete Modreski)
19 Jan-11:43:30 Re: unsure about japan law twin, please help. (Roger Warin)
19 Jan-11:38:59 Re: andreas gerstenberg collection (Jordi Fabre)
19 Jan-11:19:56 Re: andreas gerstenberg collection (Andreas Gerstenberg)
19 Jan-07:29:09 Re: franjungle collection (Franjungle)
19 Jan-00:06:45 Re: locality for this probable natrolite (?) specimen? (Pete Modreski)
18 Jan-23:34:38 Re: unsure about japan law twin, please help. (Bob Morgan)
18 Jan-20:52:32 Re: locality for this probable natrolite (?) specimen? (Pete Richards)
18 Jan-20:32:44 Re: locality for this probable natrolite (?) specimen? (Rweaver)
18 Jan-20:02:27 Re: locality for this probable natrolite (?) specimen? (John Medici)
18 Jan-19:09:28 Locality for this probable natrolite (?) specimen? (Pete Modreski)
18 Jan-18:56:47 Re: favourite fluorites? (Colin Robinson)
18 Jan-18:55:42 Re: unsure about japan law twin, please help. (Dennis Beals)
18 Jan-16:30:16 Re: collection of michael shaw (Crosstimber)

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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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