Stamped 'Sig Be Au'

I have a pair of white metal earrings that are stamped 'Sig Be Au’
on the posts. I think ‘Be’ is Beryllium, and Au is Gold, but what
is ‘Sig’?

LaVerne

Could SIG possibly be the maker’s initials?

Lee Einer
Dos Manos Jewelry
http://www.dosmanosjewelry.com