An idea for adding utility to Ruby Sightstone

What if Ruby Sightstone had a passive like this-

"Unwarded brush (800 range around your champion) has a glittering red particle effect if it contains enemies or visible enemy traps." (visible enemy traps would be like Caitlyn's, Nidalee's, that you can see in the open, not like Teemo's or Shaco's which are only visible with pink ward or red trinket.)

It would add a bit of safety to warding in your own brush when you're behind, without being so op that it could be abused.

I know people have a lot of really interesting utility ideas for Ruby, so if you have any - feel free to leave them below! :)

Edit - And I just remembered some champions have the ability to become invisible, so perhaps this utility shouldn't work on invisible champs? It might be too strong against assassins. I'm not sure though.