The word “window” here is literal. The top of the stone is cut flat, so you look straight down into the druzy, the way you would look through a small window at a field of tiny crystals. What you see is a bright blue surface that sparkles and shifts color a little as the light moves.
That is the part that sets a titanium druzy apart from a smooth cabochon. A cabochon gives you one even shine, while a druzy gives you thousands of small points of light. The blue comes from a titanium coating, which adds the metallic tone you normally don’t get from natural druzy stone alone.
The round shape is easy to work with. It sits well in a bezel, looks balanced in a pair of titanium druzy earrings and is a popular choice for a druzy ring where you want the stone to be the main feature. A smaller round also makes a neat druzy pendant, simple and bright without needing anything around it.