Can I control the visibility of edges in a cycles wireframe? I want to create a (barely) visible seam like this.




Beveling that edge to create a face and assigning a darker material to that face is one solution, however it is cumbersome, breaks the topology and interferes with the bevel modifier (causes artifacts).

What I am trying to do is add a wireframe shader but control which edges will be shown. Is this possible?
One simple way to do it is the following:


Mark the edges as Freestyle Edges
Enable Freestyle
Configure Freestyle to only show marked edges 
Configure the Freestyle line style to set the thickness and color




EDIT If you want thinner lines on objects that are far away, see this question: How to make freestyle lines stay the same size?