Crystal vibrations facilitate meditation by helping you relax into a quiet state of mind, focus on an intended goal and ground you. They also help heal you emotionally, spiritually and physically. You can use one crystal or a combination of crystals.
Ancient people believed in the healing energy of crystals, not because they just didn't know any better or were highly susceptible to the powers of suggestion, but because it works. This is why crystals are still used in healing practices like Laying on Stones and Reiki. Various gemstones help heal different areas of the body, depending on their crystalline structure and color.
Crystals do not come in one-size-fits-al so to speak. While there are similarities within certain groups, like the various types of quartz or garnets, each different type imparts a very specific list of benefits. Healing crystal pouches or bags contain a variety of crystals. There can be any number of crystals in the bag but commonly there are 3 to 9. The crystals may be chosen to cover all the chakras, combined according to your zodiac sign or put together for a specific use to benefit specific areas of the body.
Program your new crystals and stones to enhance their natural abilities and focus their energies on your desired goals. There are several tried and true ways to do this. You should use the method that feels right to you. If you are not sure which method you should use, try a different method on each crystal or stone to see what works best.
Crystals and stones absorb negative energies from you, others and the environment. You must clear these negative energies every now and then to keep your crystals and stones functioning to their full potential. Cleanse your crystals and stones right away as soon as you get them home. They will have absorbed negative energy from their previous handlers or environment.
There are a couple different approaches to choosing the right crystals or stones. Either way is perfectly acceptable. However, the bottom line is -- if you are drawn to a particular crystal or stone and it just feels right, it probably is. You simply need to go with what's right for you.