From Wiki:
There are over 150 grades of stainless steel, of which fifteen are most commonly used

Stainless steel is used for jewelry and watches with 316L being the type commonly used for such applications. It can be re-finished by any jeweler and will not oxidize or turn black.

The Gateway Arch (St. Louis) is clad entirely in stainless steel: 886 tons (804 metric tonnes) of 0.25 in (6.4 mm) plate, #3 finish, type 304 stainless steel.

http://en.wikipedia.org/wiki/Stainless_steel