Yes, I have.
You can often see windowing, during presentations.
I have seen windowing, in AAAA Stones!

Hello! This is the very first time that I posted. I have a question about, "windowing"? I have read many articles on that subject; there are two types of "windowing" in Tanzanite. I have never heard any discussion or explanation; as to why there is so much "windowing" in Tanzanite. I would appreciat...