I was also going to make a post about this - but not exactly the same issue. Rockertunity sparkles are nearly impossible to see against certain terrain backgrounds. I always use NXT and when in the desert or in the ice cave (banite ore) I often have to walk around to every rock until I can figure out which one has the sparkles.
So I agree that things need to be tweaked - but also within NXT and I hope they read your thread and become aware of this issue.
I'm on NXT and they're very easy to miss unless I've got the dusk skybox on. And on some large rocks they're actually totally invisible because they don't protrude out of the rock at all.Nerding out over RS quests since 2004