Matthew, Very small-time jewelers like myself have established
relationships with casting companies to take care of our casting and
sometimes finishing needs, as the equipment for casting and
finishing in production quantities can be very expensive. These
companies supply the metals, and are familiar with the
characteristics of their chosen alloys, so they know how to get
repeatable results. Many of us also have relationships with precious
metal refiners, who can take our scraps and bench sweeps and turn
them into usable metal or into money. You don't mention how the
jewelers or the foundries can acquire your gold.
I would be happy to work in eco-friendly materials, and would be
happy to have pieces in your catalog, just tell me where I can send
my originals to be cast at a reasonable price into your gold, and
where I can send scraps and sweeps.