Hmm. I expected a bigger luminance boost from the GC.

I'm pondering why you don't see any shadow from the band. Is this just a coincidence? Is the light angle causing the shadow to fall exactly behind the band where we can't see it? Or perhaps you have "cast shadows" disabled for the gold band?

I see the shadows from the figure on itself, under the chin, and falling on the stone, too. But it's very weak.

You didn't show me the light parameters so I can't verify the color of the light and the intensity. You said it's at 40% for the main light.  Is it white?

When I render with a 40% white light, with GC 2.2, and the properties set same as you, I get a lot of light in my test scene, attached.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)