I had a bride show me this picture. She like the color of the bottom layer (assuming it's some sort of gold luster dust). What color do you think it is or where could I buy it or what colors do I mix to get it? Was thinking maybe it's champagne luster dust but not to sure. Please help!!!

That looks like a gold dust with some pearl in it. I'd say it was the basic Super Gold with some pearl in it, because on its own the super gold is a little darker. There are a lot of gold dusts on the market now, just make sure that you're using one that's either FDA approved for food or non-toxic. Some are decorative use only, which could just be a labelling thing and they're really non-toxic, but you can't be sure.

i was going to venture a guess of silver + gold but gold + super pearl sounds very reasonable too as cc recommends --

i would just whip out my powders and start mixing

wonder what gold plus black would look like probably ugly 

idk best mixing to you