I have a crystal on the kitchen table in front of the window where i have my plants. mostly all of them are thriving despite my negligence. so crystals hold life affirming power, i'm sure of that.
i know that rose quartz is good for healing, but i don't know much more than that.
my friend does healing with crystals...not just rose quartz but clear crystals and chunks of amethyst too.
i have several small crystals around the house. i find them sometimes when i 'm not looking for them.
they make me smile.