Hi, im new here and not even sure if im in the right place.

I have a small online business and i use ready made blank jewellery to use with resin. I have a popular ring that is a band with a channel around the entire ring but i can only find these rings online in Titanium and stainless steel. I have many requests for 9ct Gold and Sterling silver which is proving to be hard to find blanks in all sizes.
I buy all my gold and silver from 2 suppliers only.. Cooksongold and Caverswall Mineralls. Cooksongold do have a ring that could be used in gold and silver, its an eternity channel set ring blank but they only have it available in one size. As Im not a jeweller making the blanks myself is out of the question.

I did buy some silver wedding bands and a friend tried to turn them and add a channel to the rings but it failed and kind of warped and melted the metal.
Can anyone recommend a supplier that would have similar rings in multiple sizes in gold and silver or recommend anyone that could make them on request without me being required to buy in bulk.

Thanks in advance Angie