Now, RP-wise, these rings are constructed using imprinted Soul Stones from one's partner set into a gold band. The rings can't actually be made in-game mechanically, but there are various ways to obtain them with GM assistance.
... have the soul stone... and also pay a lump sump in the magnitude of 10,000 gold to a NPC to craft it.
I thiink the "price" is more of a "Leave us alone" tag... The Dms don't wanna be bothered