Hi Jen. I don't think what you linked to belongs on the "trusted pearl vendor" list because it doesn't appear they specialize in pearls. Also, the ring you linked to, with a freshwater mabe pearl and not precious metal, seems closer to costume/craft jewelry than fine pearl jewelry.
However, both the ring and the shop/s look adorable so that certainly doesn't mean you shouldn't get it or wouldn't enjoy it. Maybe you could google the company name and see if it's listed (for good or for bad) on any review sites. And/or if there's anything less expensive that you want, try buying that first to limit your loss if you're unsure about them. Good luck with it and please post a picture if you get it!
However, both the ring and the shop/s look adorable so that certainly doesn't mean you shouldn't get it or wouldn't enjoy it. Maybe you could google the company name and see if it's listed (for good or for bad) on any review sites. And/or if there's anything less expensive that you want, try buying that first to limit your loss if you're unsure about them. Good luck with it and please post a picture if you get it!