Carpetsahib

The WHOLE Point of having a diamond sight is because
it is the one thing that will shine BRIGHTLY in all light
conditions but ESPECIALLY Back lit situations.

And the only way to install the diamond is in a setting
that "sticks out" a bit from the setting so it can catch
the light from behind and then refract it forward towards the shooter.

FYI, the other reason for installing a diamond sight correctly is the sight picture stays the same regardless
of where the light comes from - this is not so with a round brass bead and even a brass bead filed down at 45 degrees.

If you try it one day, you Point of Impact does change from morning to evening - we have a range here where the sun starts in front and finishes behind us and it is interesting when this was picked up.

There is more to Diamond sights that just installing a diamond as I have said in a few posts before.