I received this stone in a abandoned storage unit. The stone was in the rough and I used a sand grit paper of 60 and worked my way up all the way to 500 grit sandpaper. This was done by hand not machine. I do not know the type of stone. It very well could be worth a lot of money or it could be worth nothing at all. The point of my jewelry is to take something I love and turn it into something beautiful that someone else can enjoy. The colors are dominantly blue. Should fit just fine over someone's head. The Stone took about 2 weeks to sand. The best way to keep the stone beautiful is with a little bit of mineral oil.