Harder Silver Alloys

Dear Orchidians:

I am trying to find a harder than Ag-Cu silver alloy. Do you know of
any metal that I can add, besides Germanium, which is too expensive?

Best regards,

Juan Pablo Martinez Mansilla
CEO
Grupo Rex Nisi, S.A.
Calzada Roosevelt 33-86 Z.7 Edificio Ilumina Of. 801.
Guatemala Ciudad, Guatemala, Centroamirica.
Tels.:++(502) 2439 7003 - 2439 7007
Fax.: ++(502) 2439 7005