This is how the carving in the image posted by Chris Collyer on 04 Aug 06ce looked as of 12 Mar 11ce.
It is located right in the middle of the main path from White Wells to the Twelve Apostles at SE 123 460. The cup and ring appear to have weathered-in somewhat over the period since Chris’s image was taken, but are still remarkably smooth and shiny.
Image credit: Tony Morley
Interesting to see how this stone has changed in the 7 years (Feb 04) since I saw it last. I presume that it's oxidization that has darkened the carving but I'm surprised just how quickly it's happened and makes me wonder if in places of high concentrations of rock-art that new stones were carved as older designs started to fade.