OK, so let's run over those turquoise pics again, this time with some identifiers.
This is from Nacosarri, Mexico, and this is Natural. This is an area of Mexico due south from Arizona.
This is also from the Nacosarri area in Mexico - this one is stabilized.
This is stabilized - from the Royston mine, in the south west corner of Nevada - where the highest concentration of turquoise mines appears to be.
This is a green turquoise, in it's natural state, from Sonora, Mexico
And this is it stabilized brother, also from Sonora, Mexico. Interestingly - these were the same price per pound.
And this is natural turquoise from the Sleeping Beauty mine in Arizona. Arguably, the most beautiful of the turquoise, IHMO. It is a rich colour that typifies turquoise and has an interesting matrix that enhances the stone, without overwhelming it.