I am only marginally able to judge what this necklace is made of. For the $10 I paid, though, it's a steal, whatever.

Go see Wikipedia about howlite, and don't think you're getting a turquoise necklace. It's very nice though, and for the price you can't beat it. I am planning to use it to enhance my vintage suits. It's lovely costume jewelry. It gets 5 stars for the cheap price, mostly. Don't get me wrong, it's lovely and I see it enhancing a lot of my vintage outfits. But if it cost much more than this I would have been less generous, because I do know the difference between turquoise and "turquoise". The seller description is accurate: read it carefully.