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For years, diamond dealers have been arguing about blue fluorescence. The Gemstone Forecaster has always held blue fluorescence makes diamonds prettier and more valuable. Other dealers say it makes them less valuable. When our parents and grandparents were buying diamonds, the ultimate diamond was termed a blue white. This was a DEF color with strong blue fluorescence. Problems arose when jewelers began selling stones that were not DEF colors and without blue fluorescence as blue white. The FTC banned this term in 1938.The GIA recently conducted a study on the effect of blue fluorescence and the appearance of diamonds. The conclusion? Blue fluorescence either helps or has no effect on a stones appearance and most consumers do not notice anyway. Further, most veteran GIA graders thought strong fluorescence diamonds had a better appearance when viewed through the table, but saw no difference when viewed tabledown. Most observers saw no relationship between fluorescence and transparency. The bottom line is you need to look at these fluorescent stones. Take them outside in the sun and look for a blue undertone. If you like them you can usually buy them less expensively than similar stones without fluorescence.

 

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