Why does the guard of my sword glow when it shouldn't I am working on a final render for my little sword project I have been working on, but this issue perplexes me.
Essentially, when I render the scene in cycles, the guard of the centre sword glows. Initially, I thought perhaps there was accidentally emissions on the material, then I thought maybe the metal was reflecting light inwards, creating a glow effect, but I have disproven that too.
I know I could change the lighting setup to make it less obvious, but my overall goal was to get four shadows as if there are four ceiling lights, and increasing the strength seems to remove the shadows.
Here is the file: https://we.tl/t-FPs1yar0nu
Here is a reduced file:

This is what the render currently looks like:

Everything removed except the guard and lights:

Everything removed except for the guard:

Node setup for metal inside the guard (the glowing grey part):

Node Setup for the Green of the guard:

Blue light:

Red light:

Lighting setup:

Light from only underneath:

Any help is appreciated!
EDIT:
Here is the result after implementing the solution
Very difficult to say from the description. To track down the cause you can do something like the following :
Remove all the lights and world illumination, does the glow disappear? If not then there must be emission somewhere - hide everything then switch them on one by one in the outliner to narrow down which mesh is causing the problem.
If disabling the lights also disables the glow then the problem is with one of your lights or you have a material that’s effectively amplifying the incident light - disable each material until you find the one causing it and then post details and we can try and point out the cause.