March 13 to 15: AUGUSTA, GEORGIA: Annual show; Augusta Gem and Mineral Society; Aiken Gem, Mineral and Fossil Society; Fri. 10-6, Sat. 10-6, Sun. 11-5
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 Post subject: David Weinberg Discusses Color
PostPosted: Tue Feb 11, 2020 1:13 pm 
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David Weinberg, GG, discusses the definitive factors responsible for color in gemstones and how we perceive it. In our Relics & Rarities section, we feature some unusually transparent bluish green chrysoprase from the Yerilla deposit in Western Australia.

http://www.multicolour.com/newsletters/ ... b-2020.pdf


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 Post subject: Re: David Weinberg Discusses Color
PostPosted: Thu Feb 13, 2020 5:29 pm 
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Interestingly, I have attended yesterday a very interesting conference from Pr Emmanuel Fritsch on the same subject (how to describe colors in gemstones) and explaining very clearly why gems' colors cannot be faithfully reproduced on photos, and why they cannot be reduced into percentages and figures.


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 Post subject: Re: David Weinberg Discusses Color
PostPosted: Thu Feb 13, 2020 9:22 pm 
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Very interesting.
Dr Emmanuel Fritsch is one of my most respected people in our industry.
Is there a corresponding article with the talk?


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 Post subject: Re: David Weinberg Discusses Color
PostPosted: Fri Feb 14, 2020 10:12 am 
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I think there will, in of the next issues of our paper Revue de Gemmologie. It will be in french though and I doubt you can see it online. If you like Barbra I can send you a scanned copy when it comes out.


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 Post subject: Re: David Weinberg Discusses Color
PostPosted: Sat Feb 15, 2020 1:29 am 
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That would be super.


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