First it is highly likely what they want is tungsten carbide (a
ceramic) not tungsten metal. There is a huge amount of tungsten
carbide jewelry being sold right now. Tungsten carbide is a powdered
ceramic that is sintered with a binder of with cobalt and possibly
nickel. This material is very hard and is ground with CNC diamond
machining centers to shape it to its final form. I do not know of
anyone who is working it with it as a studio material, it is all as
far as I know industrial production.
Tungsten metal is a dull looking metal that has a rather fibrous
structure. It is also produced by sintering, you cannot melt it to
make an ingot or cast it due to its very high melting point 6192 F
(the highest of any pure metal). It is not at all ductile at room
temperature, it must be heated to at least a high red heat to form
it with out it breaking.
James Binnion Metal Arts