Wishing Stone
The wishing stone appears often in folklore; it must be used for good, not evil, or it will have no power.A stone with a hole in it is a "wishing stone." After making your wish, place the stone near your bed or over a doorway. The stone retains its powers and can be wished on again and again. The wishing stone with a hole in it probably derives from the "hag-stone," a naturally perforated piece of flint used as a charm against evil or hung around the neck for good luck.
(Europe)
Any stone from a place that is a "spirit-home" to you (close to your heart) can be endowed as a wishing stone. Rub the stone gently as you make your wish. The more often it is used for good, the more powerful it becomes. This probably has its origins in Aetites or Eagle-stones, also called gagites. These stones, found in eagles' nests, were said to have magical properties.
(England)
If you find a round stone, spit on it and throw it over your left shoulder as you make a wish.
(England)
As you skip a stone across a body of water, make a wish. Count the number of times it skips. If it skips an even number of times, your wish will come true; if it skips an odd number, the wish will not come true.