The Onyx Annulet ring is not worth using as a Shadow Priest for most people. The ring generally gets beaten by a 405 crafted ring in single target, and an even lower ring in AoE scenarios. It might get buffed again but until this it is not worth using due to the severe loss in secondary stats using the ring.

If you still want to see the rankings...current rankings of the various stones:
Single Target: Freezing Ice Stone > Flame Licked Stone > Humming Arcane Stone
AoE: Infused Stone > Pestilent Plague Stone > Freezing Ice Stone
IcyVeins Guide: https://www.icy-veins.com/wow/shadow-priest-pve-dps-gear-best-in-slot

대부분의 암사들에게 흑마노 반지는 추천할만하지 않습니다.
단일에선 405 제작 반지랑 비슷하며, 광에선 더 낮아지는 추세를 보입니다.
만약 더 버프가 되지 않는다면 2차 스탯 비는 것 땜에 더 구릴듯 하네요.