Having had a close relationship with any particular crystal for a period of time at length seems to result in an alignment of the energy of the crystal and that of the user/wearer. We arrive at a point where the crystal seems to do nothing for us anymore (at least not in a way as noticeable or pronounced as when we first met the crystal).
I have found that by cleansing it and putting away for a while serves to re establish the initial energy of the crystal and move our own energy out of alignment with it.
We might move on to work with another crystal or crystals over a period of time and then after some time come back to the crystal that we felt had become aligned to our energy to find it every bit as sensational as when we very first held it.
I thought I'd post this as after some time of use, crystals do seem to lose some of their vibe but this does not mean our relationship with that crystal has run its course.