Flourescence...when should you want it/don't want it

TPF may earn a commission from merchant affiliate
links, including eBay, Amazon, and others

#2
I have faint flouresence on my I stone. At least one of the stones in my Rolex also has it.
If you have a lower colored stone, some flouresence can help offset any hint of the warmth.
 
#3
So is flourescense a negative quality of a diamond? Sometimes on GIA reports I see blueish or yellowish under flourescensce...I used to deselect diamonds that have flourescence in them...
 
#4
no, not negative unless it has strong flourescence and then it can make a stone look milky.
Faint flourescence merely evens out a warmer color.
 
#5
30% of all diamonds have a blue flourescene. The flourescence seems to be based on the mine and location a diamond comes from. Chances are if one diamond from that location is flourescent, most of them will be. The only time it lowers the value of your stone is if you have a very high color and clarity grade with a high carat weight and a strong or very strong blue flour. But it only lowers the value by 1 to 5%. So if you have a 2 ct E VVS1 stone with strong blue flourescence, your stone's value would be 5% less than if it didn't have the strong blue flour. Strong flour does not affect any color grade diamond with an SI1 or lower clarity. Yellow flour is classified as extremely undesireable. However, diamond dealers don't discount for it. It is so subjective. I personally wouldn't rule out stones that have it.
 
#7
The reason it's considered undesireable by some is that it's not pure color when you're dealing with flour. It can make a stone appear whiter than it really is. And like Swanky said, when it's strong blue, it can sometimes make the stone milky.

I have owned a few stones that had it in various degrees, but my current stone is a Medium to Strong Blue and it does not milk up at all. No oiliness or anything. It also helps the appearance to be whiter and looks cool in sun light. lol

personally, I scout it out. I love it. Some people believe that it "taints" the stone to be less perfect. If you can get a D with Medium Blue or Strong Blue that's not Milky...that is a really cool look.
 
#8
I agree with Ame. Some people sought after medium or strong blue florescence diamonds back in the days because it would give a cool 'bluish' hue to the stone making it appear whiter. This trail of thinking has changed recently though. Florescence that are marked as 'none' on a diamond is considered ideal. Slight florescence is considered okay for all diamonds regardless of color.
 
You must log in or register to reply here.
Top