to cut a glass tube you just need to rotate the glass against a glass cutter until the etch the cutter make meets the starting point. Then you tap gently against the inside of the tube along the etch the cutter made. In the late 70's and early 80's there were bottle cutters that did this so you could turn a normal glass bottle into a drinking glass.
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Yes A laser cutter or water jet cutter will cut it without cracking it.
You can cut vinyl and make stencils to use with paint or glass etching. You can cut fabric, felt and chipboard. You can cut out shapes to use on cards or scrapbook pages.
You will probably get a cut HOWEVER It may also get stuck where you sat on it.
FLUTE
Lead glass is made with lead oxide PbO this makes it dense. It also has a higher refractive index than ordinary glass. It is sometimes called "lead crystal glass" and has been used to make cut glass ornaments and decanters. There is a lead poisoning risk from drinking wine that has been stored for long periods in lead crystal decanters.