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Diamond Fluorescence
Some diamonds reveal a change in colours when ultraviolet light falls on them. The light may be from sun or from fluorescent light bulbs. This characteristic of the diamonds showing another colour in the light is called fluorescence. When buying the diamonds, you should ask the jeweler for the certificate disclosing fluorescence quality of the gemstone to determine its prices correctly. The certificate indicates if the diamond’s fluorescence is blue, white or yellow and the prices will be fixed accordingly. You will also know from the grading report if the diamond fluoresces very strongly, strongly, moderately or has a weak to faint fluorescence.The certificate indicates if the diamond’s fluorescence is blue, white or yellow and the prices will be fixed accordingly

Fluorescence determines the prices

Fluorescence plays a crucial role in deciding over the pricing of the diamond you are buying. We all know that yellowish diamonds are tagged lower on price charts. This is true also in fluorescence diamonds as well. The gemstones that disclose a strong yellowish fluorescence when put under ultraviolet light are graded as lower in quality and prices are reduced substantially

On the other hands, the diamonds revealing blue fluorescence are accepted as having higher quality as they appear bluish white and match with colourless or near colourless diamonds

However, fluorescence is not noticeable in some diamonds and there is not much adverse impact on their value as such diamonds are brilliant naturally

Here is the chart to help you in comparing the fluorescence diamonds prices in keeping with their colour and clarity

For D to H colours IF to VS SI1 to I3
Very Strong Fluorescence -8% to -12% -3% to 0%
Strong Fluorescence -5% to - 7% -1% to 0%
Medium Fluorescence -2% to - 4% 0%


For I to N colours IF to VS SI1 to I3
Very Strong Fluorescence 0% to +4% 0% to +4%
Strong Fluorescence 0% to +4% 0% to +4%
Medium Fluorescence 0% to +3% 0% to +3%
Slight to Faint 0% to +1% 0%

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