I do understand your situation, as I tend to make rather
out-of-the-ordinary stuff that casting companies, manufacturers, and
platers all see as ‘weird’, and therefore they don’t want to deal
with it, or they simply don’t know how to extend their skills beyond
the usual stuff you see in the mall. Your local jeweler may not have
a large enough rectifier to plate a large piece, if what they are
used to is plating delicate diamond rings.
I have found a plater in North Hollywood CA who can cope with the
strange stuff. He was recommended to me by a movie prop-maker.
F and H Plating
12025 Vose St.
North Hollywood CA
That said, I would wonder about the polymer clay part of the
project. Plating requires acid, especially for the nickel
undercoating, and this could eat away your clay. The rubies are of
course no problem, but you cannot plate with soft materials in place
such as pearls, amber, or lapis.
I’m sure you’re aware that on a ring, the customer will only be able
to wear it for a few weeks before the plating wears off. If this is
for occasional ceremonial or costume use, that’s fine, but I’ve just
run an experiment on this, and daily wear of a gold-plated ring had
the gold rubbed off within three weeks. As long as the customer
understands this, you’re good.
Mad Jeweler’s Workshop