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Body Colour

Fluorescence

 

 

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Colour

FLUORESCENCE
 


Rough diamonds with
different fluorescent colours

About fifty percent of diamonds will glow when subjected to ultra-violet light. The glow, or fluorescence, results from the interaction between the light's energy and the atoms in the diamond.


About ten percent of diamonds fluoresce strongly enough to make a noticeable difference between the diamond's colour in incandescent light (which is low in ultraviolet) and in fluorescent or sunlight (which are high in ultraviolet)
Rough diamonds with different fluorescent colours.


Diamond showing blue
fluorescence in ultraviolet
light

The most common fluorescent colour in diamonds is blue; others are yellow, green and greenish blue.


Very strong blue fluorescence can make a diamond look cloudy or "oily", and yellow fluorescence can make a colourless diamond look more yellow than it really is, both can greatly lower the value of the diamond.


Generally, the higher the quality of the diamond, the more strong fluorescence will lower the value.


However blue fluorescence can make a lower colour diamond, appear a little whiter than it really is, which can increase the value somewhat.


Diamond showing blue fluorescence in ultraviolet light.

 

APPROXIMATE PRICE CORRECTIONS FOR BLUE FLUORESCENCE

 

BODY COLOUR STRENGTH OF
FLUORESCENCE
CLARITY IF-VVS CLARITY VS
D-F
D-F
D-F
VERY STRONG
STRONG
MODERATE
-12 %
-9 %
-5 %
-8 %
-4 %
-2 %
G-J
G-J
G-J
VERY STRONG
STRONG
MODERATE
-8 %
-6 %
-2 %
-4 %
-2 %
0 %
K-M
K-M
K-M
VERY STRONG
STRONG
MODERATE
+ 3 %
+ 2 %
+ 1 %
+ 3 %
+ 2 %
+ 1 %

WEAK BLUE FLUORESCENCE USUALLY REQUIRES NO DISCOUNT
YELLOW FLUORESCENCE MAY REQUIRE AN ADDITIONAL 5% TO 10% DISCOUNT

The ANTWERP IDEAL has "NONE" to "WEAK" FLUORESCENCE ONLY

 

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