On My Radar: Shirt Collar Necklaces

1.Dannijo 2.Lanvin 3.Marc by Marc Jacobs 4.Delfina Delettrez 5.Fiona Paxton
Lately I have been obsessed with all of these "Shirt Collar" necklaces that are starting to pop up everywhere. I think they'd be the perfect way to dress up a t-shirt! What do you guys think? 
xo SideSmile,
Ashley