What is the rarest type of turquoise?

Related questions

1. Is Turquoise a warm or cool color?
2. Does turquoise turn green with age?
3. Is Teal closer to green or blue?
4. Is dark blue a cool color?
5. Is Green a Girl or Boy Color?
6. Does turquoise protect you?
7. Can Turquoise be worn by anyone?
8. What is the true color of turquoise?
9. Is Royal Blue a cool or warm color?
10. Why is blue a cool color?

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16. #grade
17. #chinese