At Leading Edge Water Jet Ltd. the list of materials which can be cut is extensive, and includes:

Aluminium & Alloys
Brass & Bronze
Carpet & Ceramics
Copper & Beryllium
Foam & Rubber
Glass & Acrylic
Granite & Marble
Hastelloy
Phenolic - Plastics
Porcelain
Lexan
Stainless Steel
Steel
Titanium & Alloys