Sorry @lyrian, I strongly disagree with you on this point. The Serpentine Flame Ring has “Serpentine” in the name, and the item description shows it as part of the Serpentine set
However, we should clarify that when we talk about the paid DLC items being a part of a set, we’re only talking about the Serpentine Flame Ring and Jeweled Golden Grasp. Both of those items have a set name, and their item descriptions show they are part of a set. However, this doesn’t apply to Eveline’s Locket or the Mirror Shield, neither of which have set names or have set indicators in their descriptions.