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Scientific researches state that fluorescence improves diamond’s appearance. Diamonds with yellow tint and strong fluorescence look brighter in the sunlight – thanks to a neutralizing inner blue glow.
Scientists at HRD Antwerp, one of the world’s top gemological laboratories, conducted a study of fluorescent diamonds in 2018, and published the results in HRD’s Journal of Gemology. They took several dozen round, brilliant-cut diamonds with D-J colors and different fluorescence intensities, and observed the stones under four different lighting conditions. Under simulated outdoor and indoor lighting, the scientists concluded that the UV component positively influences the stone’s color appearance. As the UV component diminishes, the effect decreases as well. In addition, the research revealed a color improvement in Indoor conditions for very strongly fluorescent diamonds.
Scientists at GIA in Carlsbad, CA, another of the world’s leading gemological laboratories, also studied fluorescence. Their research showed that for the overwhelming majority of diamonds, the strength of fluorescence has no widely noticeable effect on appearance—but strong blue diamond fluorescence could be beneficial. GIA’s diamond color grading scale runs from D to Z, with D being colorless (most desirable) and Z having a noticeable yellowish, brownish, or grayish tint. For diamonds graded lower on the color scale (for example, I to N colors) with a faint yellow tint, moderate-to-strong blue fluorescence may cancel out some of the yellow and give a better color appearance than what its color grade would indicate. Thus, strongly blue fluorescent diamonds were perceived to have a better color than the grade in diamond grading report.
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Scientists at GIA in Carlsbad, CA, another of the world’s leading gemological laboratories, also studied fluorescence. Their research showed that for the overwhelming majority of diamonds, the strength of fluorescence has no widely noticeable effect on appearance—but strong blue diamond fluorescence could be beneficial. GIA’s diamond color grading scale runs from D to Z, with D being colorless (most desirable) and Z having a noticeable yellowish, brownish, or grayish tint. For diamonds graded lower on the color scale (for example, I to N colors) with a faint yellow tint, moderate-to-strong blue fluorescence may cancel out some of the yellow and give a better color appearance than what its color grade would indicate. Thus, strongly blue fluorescent diamonds were perceived to have a better color than the grade in diamond grading report.
