ryasni
Ryasni are strings of jewels and pearls worn in formal settings by Periaslavlan women. Usually they are attached to kokoshnik.
From the Books: "The ryasni, made of yet more pearls and emeralds, cascaded from her kokoshnik, swirling in glittering patterns as she turned to speak to each of the husbands, both hers and Anzhela’s." - IAAWT, p. 102