The item ID for Ahzidal's Ring of Arcana in Skyrim on Steam (PC / Mac) is:
Dawnguard DLC Code + 01DB9B
To spawn this item in-game, open the console and type the following command:
player.AddItem Dawnguard DLC Code + 01DB9B 1
To place this item in-front of your character, use the following console command:
player.PlaceAtMe Dawnguard DLC Code + 01DB9B
Find below information about Ahzidal's Ring of Arcana in Skyrim.