Golden Prism Jewellery

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Fluorescence is a phenomenon which causes some 35% of gem-quality diamonds to glow under ultraviolet (UV) light which is abundant in natural daylight and some artificial lighting.  This glow lasts only as long as the diamond is exposed to the ultraviolet rays.


In more than 95% of the diamonds that exhibit fluorescence, the colour seen is blue, and in rare instances green, yellow, orange, or a combination of these colours.


Fluorescence is caused by the presence of nitrogen or other impurities in the diamond crystal structure and does not have any influence on the hardness or durability of a diamond.



In addition to colour, fluorescence also varies by strength – from none, feint and medium to strong and very strong, as described by GIA grading reports.  The fluorescence colour and its intensity are additional characteristics that can help to identify a specific diamond.


GIA studies have shown that, for the overwhelming majority of diamonds, the strength of fluorescence has no widely noticeable effect on appearance. In fact, many people prefer the appearance of diamonds that have medium to strong fluorescence.  In very rare cases (less than 0.2% of fluorescent diamonds seen by the GIA), some diamonds with extremely strong blue fluorescence may appear hazy or oily, and gemstones with such characteristics are slightly less desirable.  Diamond fluorescence is a natural phenomenon and is best judged by considering each individual diamond on its own visual merits.