They are all treated. Untreated stones, such as Rubies and Sapphires, are not crystal clear, nor can you really see through them at all, if untreated. The untreated stones, are worth a lot more than the treated ones, even though the treated ones are far more sparkly, because it is hard to find untreated gems, anymore. I have untreated a $700 Sapphire, and a $900 Ruby. Along with treated ones.