we have the three elven rings now with The Grey Havens, and the Ring of Barahir (not one of the rings crafted by Celebrimbor, but a ring nontheless), and The One Ring is in the saga (which is where it should be, imo)
we also have Celebrian's Stone
i would like to see more lore-related artefacts in general. i don't think it's necessarily a critique of how much the game has or has not included of them, but the player card pool is actually quite small compared to other games, especially for how long this game has been out.