African Turquoise beaded Necklace Chunky Ovals of Lime Green long 30"

Chunky Ovals of Lime Green African Turquoise Necklace long 30" I thought this was just some sort of Jade but I've shown it to a few experts and they seem to think it was lime / african turquoise. They are cold to the touch and beautiful stones. I can't "authenticate" that stone , but if you know any other info please let me know.