Shapes Cut

How can I cut shapes into the surface of a glass bottle?

Glass is usually cut by scribing a distinct scratch with a diamond or carbide tipped tool and then bending the glass along the scribed line, with fingers or pliers or over a dowel or edge and the glass will crack along the line. Curved lines and circles are normally run (making the crack run along the line) by tapping on the opposite side of the scratch just ahead of the crack proceeding through the glass which can be seen as a silvery surface inside the glass.

Diamond Shapes and Cut Styles