No I don't know of one, the bulk of what we have now largely seems to be like random Etsy profiles.
If I personally were to ever do such a business, I would either learn to do the smithing and gem-cutting myself or become close friends with people who do. That way you can totally assure spiritually that they are quality and Satanic goods. Doing spiritual works on the gems. They would be worth a lot more in the future than most other non-Satanic jewellery, especially if you also physically inscribed power into them in runic engravings and whatnot
The same thing would apply to if you had a restaurant or shop. Creating/procuring your goods locally and then having the closer physical bond to enrich any spiritual works you do on your goods.
But that's just me dreaming there. It takes a lot of effort to be able to do all that, because the means aren't currently in place or in your favour (unless you are wealthy enough and driven enough to do that)
You are better off just buying jewellery normally and getting it engraved. The intrinsic nature of a metal doesn't change unless you know, the consistency of it isn't pure.