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What causes blue arrows in diamond?

idaoo

Rough_Rock
Joined
Sep 7, 2020
Messages
34
diamond.PNG

What is the difference tha makes the arrows? have blue color vs all black on the left diamond? Is this less desirable?
 
Would this be a reflection from something in the room? Im interested to find out
 
It is dispersion or real fire. There is probably a mix of large and small light sources in the setup.
Look at the 3 spots I circled.
When you see a white bright spot in a real diamond - if you carefully tilt the stone you can move from white to blue one way - and in the opposite very slight tilt you go back thru white to orange yellow red.
The other end of the spectrum / rainbow.
You rarely see green because the mixing of the sepctrum adds up to white

1599771095147.png
 
It is dispersion or real fire. There is probably a mix of large and small light sources in the setup.
Look at the 3 spots I circled.
When you see a white bright spot in a real diamond - if you carefully tilt the stone you can move from white to blue one way - and in the opposite very slight tilt you go back thru white to orange yellow red.
The other end of the spectrum / rainbow.
You rarely see green because the mixing of the sepctrum adds up to white

1599771095147.png

Thanks for your detailed reply. To an non-expert like me though, what does it mean black arrow vs blue? Does it say anything about the diamond quality (blue being inferior for example). Or is it purely slight variation of light angle when taking photos of the diamond? Seems odd that most diamonds show black arrow on WF site while few are blue like the one on the right.
 
What are the numbers, ASET, IS images?
 
Black is the camera lens. Blue is coming from light another direction.
Slight facet angle differences cause the difference
 
What about when all arrows are black and one is white. Does that mean leakage?
 
What about when all arrows are black and one is white. Does that mean leakage?

one facet is getting light from somewhere
 
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