With so many crystals to choose from, it can be difficult to know which is the right one for you. If one is gifted to you, it makes it easy. If you have no idea what you want your crystal for, but are attracted to the idea of wearing one, then your date of birth is a good starting point and you will find your birthstones.
You can also pick out a crystal at random. Trust your intuition. The crystal that speaks to you will be right.
Handle several, allow yourself to be drawn to one, or put your hands into a tub of crystals until one sticks to your fingers. If that crystal makes you tingle, it is the one for you. Remember that big or outwardly beautiful is not necessarily most powerful. Small rough crystals can be extremely effective.
Before you use your crystal, remember to cleanse it first.