Crystal & Stone wands are used to direct energy. The pointed or narrower end points to the direction that the energy will flow towards, and the larger rounded end pulls energy into the wand.
They can be used to activate grids, add their energy to something, or draw energy away from/out of something. To add their energy to something you direct the point towards that something, whether it be a person, place or thing. To pull energy from something (drawing pain out for example) you place the larger end on or near something. But make very sure that the narrower/pointed end is pointed at the ground, as what you are drawing out will travel through the wand and come out the other end. Please make sure that there is not a person, animal, plant, other stones etc. in that path. This is why they are wonderful for gentle massage, but are often used incorrectly.
Rounded shapes are more suited for healing work, as they carry a gentler energy. I recommend a, natural, faceted or spiral shape for grid activation.