Citrine Question...

I have a friend who uses Citrine often. She only cleanses it by using clear quartz and her healing breath as water and sun damage Citrine.

But her Citrine still gets large white patches in it, as if she has drawn out all the goodness in it she says. Any ideas whats happening with it??? She does carry it against her skin a lot, my only thought was perhaps the oils in her skin are causing the damage?

Any suggestions?