I know this should probably be under the gemology section but, it really has me wondering. I put a crystal in my moms room to help her(she picked it out herself), it is a smoky quartz crystal and was actually pure white when  we put it in her room two months ago. I brought it out for my normal routine of clearing the house crystals when I discoved it has turned dark brown , and I mean dark. It has not been near the sun or any light source, which I know can affect the change in a smoky quartz.
I would appreciate some input please...
Im also thinking about adding a black tourmaline in her room too, but dont know about clearing them, or if they need to be....Can anyone help here?

Ok as much as my limited knowledge goes, first put this gem in salt water for a day (24 hours) to clean it out.

Second I think there were some energies working on it to make it that colour, apart from it I have no idea (as of now).

Okay, Im familiar with that routine, I keep a large quantity of sea salt handy for clearing purposes only, thanks.

Sorry that is all I could come up with now, I am thinking if I get more answers I will get back to u.

I don't know if you have read this section about smoky quarts, but it seems it has diffrent colors.

here is the link

http://mineral.galleries.com/minerals/gemstone/smoky_qu/smoky_qu.htm