Rosanna,
In your first images the stone is Chinese, most likely stabilized, if not I would bet they were soaked in paraffin. I doubt they are dyed.

In your image of the melon beads these might be dyed howlite, if you do a google search on howlite you can see images of it in its natural state and also dyed to look like turquoise. Again most likely Chinese made.

The third group again Chinese and perhaps natural. Even if natural they have a bad habit of soaking turquoise in paraffin.

Hope this helps

All my best ............ Danny

P.S. The best way to see if they are soaked is break a bead, most likely it will be near white on the inside. This is not high grade turquoise although it is visually very pleasing to the eye.