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PostPosted: Tue Oct 06, 2009 2:58 pm 
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So glad to hear from you!
We've missed you. :D


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PostPosted: Tue Oct 06, 2009 4:53 pm 
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Welcome back, Winstone! And what a great idea ... melee! Whodda thunk?? 8)

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PostPosted: Fri Feb 05, 2010 4:36 am 
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Recovery is better than the alternative. While lying in bed, I thought how to make simpler tests for gemologists as well as some new designs of equipment that may help gemologists identify unknowns....

Observations:
Color grading for GeW if on Stuller is what Signity offers as inventory. Signity had a download for free, we downloaded it and examined the Stuller gembook and voila, a match....hummm

When I attended the First Colored Stone Congress in Tel Aviv in 1983, I met Howard Rubin who had developed Gem Dialogue. Howard told me that with his system he had to go the expense of using a single color lot to
print his samples on paper and plastic. Most people do not realize that even with printing ink, identical color lots are not the same color.

I own two Gem Masters by GIA, have used their system, and own many editions of past issues of the Guide. If you guys are planning to use millee for master sets, may I recommend that you get these sets verified by female graders. Females do not have the color blinded problems of males.
Yet, ironically most colored stone dealers are male, and 25% of those guys are either color blind or have gross deficiencies in their own color perceptions.

When I include a color grade in an appraisal I state " In my opinion after comparing the gemstone for color, I have concluded that it is closer to master stone X, and has an aparant master color grade on GIA Colormaster of ------------ and an image of ------- color as seen in the digital photo, as well as color print on appraisal noting that colored inks on paper and in photos may not agree with GTL findings." On important stones I suggest second opinions as to color of a gemstone items.


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PostPosted: Sat Feb 06, 2010 11:15 am 
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You raise an interesting point Winstone.....the calibration of Gem Dialogue.

Not only do inks vary from printing to printing, there can also be a degradation of the ink after years.....or chemical alterations in the paper.....or a myriad of potential environmental conditions where the book has been stored.

How would one know, after a few years or a decade, that their Gem Dialogue was still calibrated to it's original specifications?

Excellent observation.


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