This is a container item gained during the Love is in the Air event. When you give a [Love Token] to a non-guard NPC from one of the major cities of your faction (excluding Exodar and Silvermoon), you gain this and the [Adored] debuff. You cannot gain another Gift of Adoration or [Pledge of Adoration] until the Adored debuff ends. You gain this by giving a [Love Token] to an non-guard NPC while you do not have the Adored debuff. While you have the Adored debuff, you will get a [Gift of Friendship] in exchange for a [Love Token].
This gift also includes other items that you can find more about on the Love is in the Air page.
A guard NPC will give a [Pledge of Adoration] which is mostly different only in name.
There are technically 6 separate types of these gift containers, depending on the city and faction: