How does fluorescence impact diamond pricing?

Historically, strongly fluorescent diamonds have been marked down in price next to their non-fluorescent counterparts. Typically, higher colour (D-H) non-fluorescent diamonds will sell for 10-30% more than similar stones that exhibited very strong blue fluorescence. However, lower colour (I–N) diamonds with very strong fluorescence were priced up to 5% higher than similar non-fluorescing stones. This is likely due to the perception that blue fluorescence can mask the undesirable yellow tones found in some stones.

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