I saw this lone strand unmarked and loved it immediately. I didn't know what it was or how much it cost, but I really wanted it. When I asked the dealer more information about it, he wasn't sure either; but finally decided that it was Spectrolite. I think he was completely wrong. I purchased this gorgeous strand of mystery gemstone anyway. I know I'll find wonderful things to create with it, but I'm hoping someone can tell me what it is.