Comments for Kingofrocks's Weblog http://kingofrocks.wordpress.com Just another WordPress.com weblog Fri, 18 Jul 2008 18:02:07 +0000 http://wordpress.com/ hourly 1 Comment on Shedding light on diamond fluorescence by kingofrocks http://kingofrocks.wordpress.com/2008/07/17/shedding-light-on-diamond-fluorescence/#comment-18 kingofrocks Fri, 18 Jul 2008 18:02:07 +0000 http://kingofrocks.wordpress.com/?p=11#comment-18 Honoured to have caught your attention Mr. Brandt. I hope that if we post anything completely erroneous, you'll be around to set us straight. Thanks for your input on this subject. Honoured to have caught your attention Mr. Brandt. I hope that if we post anything completely erroneous, you’ll be around to set us straight. Thanks for your input on this subject.

]]> Comment on Shedding light on diamond fluorescence by Joe Brandt http://kingofrocks.wordpress.com/2008/07/17/shedding-light-on-diamond-fluorescence/#comment-17 Joe Brandt Fri, 18 Jul 2008 11:38:32 +0000 http://kingofrocks.wordpress.com/?p=11#comment-17 Kudos on a very well-written and carefully researched article; I've been maintaining this basic stance for nearly 40 years. Although I agree with the conclusion that (in general) prices for fluorescent vs. non-fluorescent diamonds should not vary, there ARE certain exceptions. I was not present for the GIA visual testing, but I would like to point out that some fluorescent diamonds display certain visual characteristics that differentiate them from others. Firstly, I have seen (on a number of occasions) where a fluorescent diamond (viewed "face-up") WILL fool the eye (even that of an experienced jeweler) into judging the color to be better than it actually is, sometimes by several color grades. (FYI, diamond color is never graded when viewing a stone face-up.) I consider this to be a positive factor, since a "I" color (or even a "J" color) will look to all the world like a "G" or "H" color when worn in a ring, particularly in daylight. Secondly, some diamonds, especially those that display strong fluorescence, will have a slightly hazy (or "milky") appearance, which most certainly should have a negative effect on the value, as this may be observed quite easily by the keen observer, both layman and expert alike. (J.L. Brandt Company, founded in 1928, functions as a consultant to retail jewelers, and provides a jewelry advisory service to the general public.) Kudos on a very well-written and carefully researched article; I’ve been maintaining this basic stance for nearly 40 years. Although I agree with the conclusion that (in general) prices for fluorescent vs. non-fluorescent diamonds should not vary, there ARE certain exceptions. I was not present for the GIA visual testing, but I would like to point out that some fluorescent diamonds display certain visual characteristics that differentiate them from others. Firstly, I have seen (on a number of occasions) where a fluorescent diamond (viewed “face-up”) WILL fool the eye (even that of an experienced jeweler) into judging the color to be better than it actually is, sometimes by several color grades. (FYI, diamond color is never graded when viewing a stone face-up.) I consider this to be a positive factor, since a “I” color (or even a “J” color) will look to all the world like a “G” or “H” color when worn in a ring, particularly in daylight. Secondly, some diamonds, especially those that display strong fluorescence, will have a slightly hazy (or “milky”) appearance, which most certainly should have a negative effect on the value, as this may be observed quite easily by the keen observer, both layman and expert alike.

(J.L. Brandt Company, founded in 1928, functions as a consultant to retail jewelers, and provides a jewelry advisory service to the general public.)

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