Hello and welcome to the forum.I have a CWC diver, the quartz version and the luminous pip on the bezel is exactly as you describe it.My watch is @4 years old and all of the lume , including the pip is still glowing brightly. I don't think that the recessed lume will take any harm, and even if it did it is an easy job to have it re-done.I'm sure subsequent replies will advise on applying a dot of varnish or something to protect the lume. I wear mine on a Nato which I have cut the extra piece off as I find the watch sits lower , feels more comfy and looks neater..Regards, MAGIRUS.