I recommend using fine (999 pure) silver for the shell setting,
having first soldered the fine sil to the sterling. Fine silve is
soft enough to be molded round an irregular or natural shape and also
will it allow repairs by letting you remove the shell at some later
The design of the joint to the stg will be quite critical, as if
it's a small-area join then the fine sil might be too easily wrenched
away later in its life.
Without seeing your design, I can't tell if this advice is any help
to you, but maybe you're in the early design stages, and in general
you'd be best to design from the beginning with the intended setting
method quite well decided.
B r i a n A d a m
e y e g l a s s e s j e w e l l e r y
518 South Titirangi Road
Auckland NEW ZEALAND
ph +64 9 817 6816