I don't have a lot of 'formal' crystal knowledge...but I have a little pouch I wear around my neck and I sometimes take a small round pebble, just out of the flower strip outside my house...most of them are usually some type of quartz or granite, but something smooth and pretty to me...then take a sharpie and just write balance or the word focus on it, or both...
I notice the weight around my neck through out the day...and it makes me think of the word...which tends to make me remember to feel that way, or to distress or be in the moment or etc.
It does the trick.