Nice photos of a beautiful plant. One of the downsides of my routine of putting my lithops outside in the summer is they are prey to a number of insects. Both crickets and grasshoppers often chew on my lithops. Their damage is not enough to cause an growth problems but the resulting scars are not very attractive. Of course with Lithops, I get all new leaves next year. :) Thanks for sharing the many great photos of your many beautiful plants.
The problem insect for Lithops in this part of the world seems to be western flower thrip which causes damage the next year.