Where can I find Telda's Ring or Ring of the Selonan?
The locations of these 2 items are in the Wiki entries you've linked.
Ring of the Selonan:
Acquisition
Corpse in hidden cave accessible with Rope and Grappling Hook, SW of Pearlwood Bluff
Telda's Ring:
Acquisition
Sold by Lora in Lora's Mystical Goods, Copperlane, Defiance Bay