This item can be obtained from Shawn.
Shawn is located in Outland Nagrand on a large floating island southeast of Forge Camp Fear's symbol on the zone map. If you simply interact with him, there are no chat options. You must target the NPC and use the /wave emote. Shawn will wave back, signalling you've opened up the way to chat with him.
Roleplay like you are the person he is waiting for, answer in the affirmative, and the ring will appear in your inventory. (You also make him a happy man in the process.)
Shawn is the name of a security engineer for Blizzard Entertainment. Both the NPC and the ring are references to him and his marriage proposal to his now-fiancée. (Source)