why the grading labs, or buyers would not want that information like the color of the fluorescence?

[Se Um Oh]

i¡¯d like to know how to describe the color and intensity of the fluorescence on the diamond report from all labs like GIA, AGS, EGL, IGI, HRD, AGL (Association of Gemological Laboratories, Japan). I heard that some of labs including also GIA describe the intensity of the fluorescence but not the color of the fluorescence like greenish yellow.

Therefore, I asked what I said above before but I couldn¡¯t find enough answers so I¡¯m still wondering how to describe the color of the fluorescence form each of lab and why most of labs don¡¯t describe the color of the fluorescence. If flouresence can make a significant difference in the value of a diamond, I wonder why the grading labs, or buyers would not want that information like the color of the fluorescence

I hope to find what I asked above,.

 

[RockDoc]

Date: 3/25/2006 1:38:11 AM
Author:Cullinan
i¡¯d like to know how to describe the color and intensity of the fluorescence on the diamond report from all labs like GIA, AGS, EGL, IGI, HRD, AGL (Association of Gemological Laboratories, Japan). I heard that some of labs including also GIA describe the intensity of the fluorescence but not the color of the fluorescence like greenish yellow.

Therefore, I asked what I said above before but I couldn¡¯t find enough answers so I¡¯m still wondering how to describe the color of the fluorescence form each of lab and why most of labs don¡¯t describe the color of the fluorescence. If flouresence can make a significant difference in the value of a diamond, I wonder why the grading labs, or buyers would not want that information like the color of the fluorescence

I hope to find what I asked above,.

There are lots of characteristics about diamonds that almost ALL labs leave off their grading reports.

To my knowledge GIA will state the color if the fluoresence is Moderate to Strong.

It is pretty rare to get colors of fluoresence other than blue or chalky white.

AGS reports "negligible" because ALL diamonds have some sort of fluoresence. The "key" to this is the intensity of the UV light that is used. If you have a strong enough UV source, every diamond will have some minor fluoresence in it.

Fluoresence affects the value ... when the effects of it are visible in daylight, or under examination in microscope or loupe.

Fluoresence isn''t always a negative factor. In some of the lower color diamond sold, and cut well, it can cause them to appear slightly better. It is a stone by stone call, and a personal preference issue more than one that is creating a valuation result unilaterally.

Rockdoc
.

 

[Modified Brilliant]

Date: 3/25/2006 1:48:46 AM
Author: RockDoc

Date: 3/25/2006 1:38:11 AM
Author:Cullinan
i¡¯d like to know how to describe the color and intensity of the fluorescence on the diamond report from all labs like GIA, AGS, EGL, IGI, HRD, AGL (Association of Gemological Laboratories, Japan). I heard that some of labs including also GIA describe the intensity of the fluorescence but not the color of the fluorescence like greenish yellow.

Therefore, I asked what I said above before but I couldn¡¯t find enough answers so I¡¯m still wondering how to describe the color of the fluorescence form each of lab and why most of labs don¡¯t describe the color of the fluorescence. If flouresence can make a significant difference in the value of a diamond, I wonder why the grading labs, or buyers would not want that information like the color of the fluorescence

I hope to find what I asked above,.

There are lots of characteristics about diamonds that almost ALL labs leave off their grading reports.

To my knowledge GIA will state the color if the fluoresence is Moderate to Strong.

It is pretty rare to get colors of fluoresence other than blue or chalky white.

AGS reports ''negligible'' because ALL diamonds have some sort of fluoresence. The ''key'' to this is the intensity of the UV light that is used. If you have a strong enough UV source, every diamond will have some minor fluoresence in it.

Fluoresence affects the value ... when the effects of it are visible in daylight, or under examination in microscope or loupe.

Fluoresence isn''t always a negative factor. In some of the lower color diamond sold, and cut well, it can cause them to appear slightly better. It is a stone by stone call, and a personal preference issue more than one that is creating a valuation result unilaterally.

Rockdoc
.

Rockdoc,

Your explanations regarding fluorescence are concise and should be filed for reference by PS shoppers. Oftentimes, a consumer will be unaware that the pair of diamond earrings that they just purchased at a great discount exhibit strong blue fluorescence. I see this often. But as you stated, it isn''t always a negative factor and it is a matter of personal preference. It''s also a way to save some money in some cases.

www.metrojewelryappraisers.com

 

[oldminer]

ALL diamonds react to UV. SOme visibly and others react invisibly. ALL of this reaction is UV fluorescence, but only some react within the visible spectrum. "Negligible" is a good term compared to saying "none" or "inert" when there actually is a slight amount. The GIA misused "none" and although it was minor, it was wrong to use none when there is a tiny bit. Pressure from consumers and respected gemologists has brought the word "Neglibile" into more common use.

My lab, like most major labs, decribes the color of the UV fluorescence when it is medium or greater in visibility. Below Medium, there is likely no visual effect to color or transparency. Medium and higher, there may be some visible change in appearance depending on the particular diamond and how it reacts. MEdium and above, we add the color of the UV fluorescence to reports, as many other labs also do.

 

[caracol]

Hello Oldminer,

I have some questions for you,

What opinion can you give customers of the different types of branded diamonds ( eightstar, eightrinity, solasfera, H&A, A CUT ABOVE, TIFFANY; Lazare etc) on the market versus the traditional round brilliant 58 facets ideal AGS 000? Are some really more brilliant , has no light leaks, etc. or customers are just paying brand names and all are the same???

Thank you,

Caracol

 

[oldminer]

You should ask this "off topic question" in a new thread.....I and others certainly would reply.

 

[WinkHPD]

Or do a search, there are MANY threads on this very topic.