Traditionally Crystals and Reiki were never synonymous. It's only recently that Reiki practitioners are noticing the symbiosis of the two. When used effectively they can compliment each other leading to more productive sessions.

As most Reiki practitioners are not experts in crystals here are a few basic guidelines. There really is not wrong way to use them; you just need to feel positive and trust some of your own instincts. That being said you will want to have at a minimum a different stone for each chakra. The crystals themselves can go right on the body or simply close by. Quartz crystal should be considered for the crown followed by a rich blue or purple for the forehead. Aquamarine would make an excellent choice for the throat with perhaps a pink crystal for the stomach. A moonstone may be considered for the solar plexus. Abdominal area should have some gold with the pelvis using a deeper colour such as garnet. These are just guidelines but you would do well to follow the intensity pattern.

Patterns are often used with crystals. They can be placed in just about any shape; use your imagination. A star or David has been known to work well. As mentioned above using healing crystals is not part of a typical Reiki session but can be a great plus. The stones themselves are not expensive and your clients may find the added stimulation terrific. Good luck with your efforts and remember to try a few different patterns and colors to see what reiki crystals works best for you.