December 14-16—SAN DIEGO, CALIFORNIA: Wholesale and retail show; Gem Faire Inc.; Scottish Rite Center, 1895 Camino del Rio S; Fri. 12-6, Sat. 10-6, Sun. 10-5
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 Post subject: Re: Notice this on auction, and the title says GIA, but
PostPosted: Fri Aug 28, 2015 12:27 am 
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Joined: Tue Apr 30, 2013 1:41 pm
Posts: 170
While this discussion is going on, does anyone want to throw out their definition of "color-change" and "color-shift"?

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The views expressed here are the author's opinions and do not necessarily reflect those of the his employer.


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 Post subject: Re: Notice this on auction, and the title says GIA, but
PostPosted: Fri Aug 28, 2015 8:48 am 
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Joined: Wed Feb 11, 2015 5:22 pm
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Location: Lachine, Quebec
Color change - change of hue, color shift - change of tone. The first is characteristic of a small amount of precious stones and other materials, the second is common to all colored subjects and objects, including all colored gems.

Borderline might be not visible to our eyes due low sensitivity, but could be visible using specific tools...

I would define it something like that..

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All stones are alike, all stones are precious; but man sees only a few of them...
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