Thanks for the informative posts Amguy and always love your paraiba pictures.
I have one of those "supposed to be cuprian from Brazil but turned out to NOT be copper bearing and most likely is from Mozambique" tourmalines
that I got a while back. BUT it still is a pretty stone and I hope to have it set someday. It does glow in some lighting, but nothing like the "real" Paraibas. It is quite large and had I been "educated" about the price of true Paraibas when I purchased it, I would have known it wasn't the real deal. It wasn't cheap, but it wasn't thousands of dollars a carat either.
I feel confident that the stone in my ring in my avatar is a Mozambique cuprian (copper bearing) tourmaline, as it came with a GIT cert (which is a reputable lab). As I stated earlier, it has medium saturation, which means that it can wash out in direct bright sun or extremely harsh lighting, but in any indoor lighting that I have seen it in, it glows like crazy and beings I only wear it for special outings, I'm still extremely pleased with how it looks.
It it was a perfect specimen, I would never have been able to afford it, as it is 3.49ct, so the price would have been WAY out of my range.
I have two "Paraiba" matching cabs that I am sending off to AGL to verify if they are copper bearing or not and I'll post photos and results when I get them back.