Have you tried David Fell Co.? They advertise in Lapidary Journal,
they are at: 1-800-822-1996, PO box 910952, LA,California 90091-0952.
They will not have the ring blanks.
Millard Wire in Rhode Island has a fantabulous pattern wire catalog
that I drool over. Downside…you must buy 200 ( yep, that’s 2
hundred)ounces of any one pattern. I have begged and pleaded with
them to do smaller amounts. I have offered to pay more, I have
offered my first born …to no avail. Alas, I bought a rolling mill
with wire pattern rollers to roll my own wire. Godd luck, Suzanne