Surgical steel would certainly be an interesting choice of materials, if cleaned well with the right chemicals they will take years to discolour under even the most rigorous use.
With the prices of other semi-precious metals skyrocketing at the moment it would be difficult to make them in something like platinum, for anywhere near a reasonable price to the crafter at least.
Personally I like the inconspicuous little lapel pin. I like the fact that it's impossible to wear something like that at a social gathering without it inviting comment or query.
For I am the way.