u/Miserable_Fig7302

Can anyone give their opinion on whether this is turquoise or something else? I purchased this around 2000 in a department store in the costume jewelry section. I remember it had a high original price, but I got it on clearance. They have a very rough stone look and feel, so I don't think it's plastic. I know they dye or treat some stones to look like turquoise. I will like it regardless because I like the style, but I was just curious what it might be?