In fact, one primary reason the GIA developed standardized color grading using a Diamondlite box with a controlled light source was to be able to color grade diamonds while minimizing theĮric Bruton in his classic book "Diamonds" explained the impact of fluor on color as follows "If the diamond is examined in sunlight, even reflected light which contains ultra-violet light, the blue fluor will tend to cancel the yellowish body color because the colors are nearly complementary, and the stone will appear whiter than it is.
the degree of its transparency or lack of any color) and the sparkle effect provided by fluorescence (fluor) in various lighting environments. Color grading systems try their best to differentiate between the amount of color or tint in a diamond (i.e. Federal Trade Commission outlawed the use of the term Blue White for anything but blue diamonds.Ībuse of the term Blue White and the subsequent FTC restrictions undoubtedly encouraged the establishment of GIA color grading system. fluorescence) added value to white (colorless) diamonds was so abused by the trade that in 1938 the U.S. The term Blue White and the underlying concept that blue (i.e. Instead of maintaining consumer confidence in Blue White the trade began selling all types of lower color diamonds as Blue White.
The trade had something very good going with fluorescent Blue White diamonds, but they blew it. Now the history of what happened to fluorescence is very interesting and informative. Contrary to current market conditions, fluorescence added value to high color diamonds. Blue White diamonds were avidly sought out by the trade and consumers who paid higher prices for diamonds with fluorescence.
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The extra sparkle fluorescence provided when the diamond was seen face up in sunlight was accepted as verification of the diamonds high color. Ironically, during the early part of the 20th century fluorescence was seen as something that had a very positive impact on top colors. The best Jager stones were highly transparent (clear and colorless) with a bluish tint due to fluorescence. The original Blue White diamonds came from South Africa's Jagersfontein mine. Once upon a time before the diamond industry standardized to GIA color grading terminology the term Blue White (Blauweiss) was used to describe the finest color white diamonds.
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