These items

TR_m7_Ns_q_NiceRing
TR_m3_q_OE_Urien_ring
TR_m3_ring_of_lifebloom
TR_m7_ToTheLastDropRing

use model: pc\c\pc_nib_ring_xp_01.nif

and a nonexistent icon: pc\c\pc_nibringxp01.dds

however, the base nibenese expensive ring

uses model: pc\c\pc_c_nib_ring_exp01.nif which looks the same as pc_nib_ring_xp_01

and an icon: pc\c\pc_c_nib_ring_exp01.dds

The attached ESP for TR_Mainland aligns the four rings to the base model.