This is a complicated question. The value of turquoise depends on a lot of things, including grade or hardness, color, matrix pattern, whether it is natural (untreated) or stabilized or color enhanced in any way, mine, size/carat weight, when it was mined, and the jewelry it’s in if set. Generally speaking the most valuable turquoise is hard (gem grade) untreated turquoise from the classic southwestern US mines. However a lot of turquoise comes from China these days, and if it’s a high quality stone there is nothing wrong with that. Chinese turquoise often exhibits the black “spiderweb” matrix pattern that this stone has and is considered desirable—that’s why I think your stone might be Chinese. I’m going to refer you to this thread for an extensive discussion on Chinese turquoise:
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