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
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What about when all arrows are black and one is white. Does that mean leakage?
one facet is getting light from somewhere