where do you find turquoise
Almost everything I have seen is dyed magnesite and sometimes howlite. There is a turquoise from China that is yellow/brown, it gets its color from the iron in the stone or another mineral depending on the color. To sum this up, turquoise is emotional and every individual will have their personal tastes.
It is how they choose to disclose their turquoise but it is not the same standards as in the United States. If you Google turquoise mines, American turquoise, turquoise treatments, etc., you will come up with more info than you can imagine. The information is out there and this is just a very introductory article on the subject.