hi, im the anon who asked about the mermaid ring. after a bit of digging i found out the ring is most likely from omnia studios. i found other pinterest posts of the ring which sites them as a source and they do have a picture of it on their websites. the bad news is that they only make small batches of ready to wear rings and the ring isnt available to buy now, though the shop do make custom orders, they also have and instagram where you can see the ring more clearly.
the ring is called Arianna and was one of the studios first designs, heres the link to their website if your interested. https://omniastudios.com/
oh that's really cool! great job sleuthing!
maybe they'd consider bringing it back if there's enough demand?