A Waterjet can cut virtually any material you can think of, from Steel to Granite Marble just to name a few, below is a list to give you an idea.
With a Waterjet there is no heat stress on your material
Metals
Aluminum
Bonded Material
Boron
Brass
Bronze
Cast Iron
Cobalt
Copper
Exotic Alloys
Hard Facing
Hastalloy
Inconel
Magnesium
Molybednum
Nickel Alloys
Niobium
Stainless Steel
Steel Alloy
Steel Hardened
Steel Hot Rolled
Steel Mild
Steel Tool
Tantalum
Tin
Titanium
Tungsten
Waspalloy
Composites and Plastic
Acrylic/Carbon Fiber
Ceramics
Fiberglass
Foam
Graphite
Kevier
Lenolium
Mylar Laminate
Neoprene
Nylon
Urethane
Vinyl
Printed Circuit Board
Plexiglass
Poly Carbonate
Polyethelene
Polymers
PVC
Rubber
Silicone
Additional Materials
Armor Plate
Bulletproof Glass
Cardboard
Ceramic Tile
Dichroic Glass
Expanded Metal
Glass
Granite
Hardwoods
Honeycomb
Limestone
Marble
Porcelain
Quartz
Solid Surface
Silicon
Terrazzo
PVC
Rubber
Silicone