Crystals can hold and exert energy through certain vibrational pitches and are said to benefit and uplift moods and general mental wellbeing. Healing stones are all unique, so there is no particular rule of thumb or routine you necessarily need to adhere to. Placing your chakra crystals in a grid-like pattern can create a force field of energy that supercharges your healing stones to measure up their power.
Hold your tumble stone in your hand at any time, but especially when you are meditating. You can use it in meditation by holding it in your hand or placing it nears you. Whether you pick crystal bead bracelets, necklaces, or even rings, having the stone directly pressed against the skin allows healing vibrations to connect with your body and stabilize your chakras. You can carry a crystal in your bag when you are traveling or out somewhere.