Is diamond fluorescence good or bad? Fluorescence can be good or bad: it can improve a diamond’s color or make the diamond look hazy. When diamonds have Slight or Faint Blue Fluorescence, for example, they don’t appear cloudy. In fact, the slight fluorescence can make the diamond appear more white.

Is very strong fluorescence bad?

In most cases fluorescence is simply an identifying characteristic and not a performance characteristic, and is therefore NEITHER good nor bad. In some cases, strong or very strong fluorescence can make a diamond appear cloudy, diminishing its transparency and eye appeal.

Are strong fluorescent diamonds worth more?

Yes and no. Fluorescent diamonds do trade at slightly different prices than non-fluorescent diamonds, but not the ones you want. … On the other hand, a D color diamond with very strong blue fluorescence trades at up to a 15% discount to similar diamonds sans the glow.