I feel some of them do have a Bisbee or Royston look, but @Bluegreen is very right, it’s really hard to tell w/o provenance.
Very surely it’s amazing turquoise. While … this has shown me that it’ so easy to get fooled:
If it’s been really cheap it can be anything, including good candy, as seen here
(while I do not think yours is 
)
And if it’s real, it might be really valuable.