You can do a chakra assessment:
a) Using your Hands
b) Using a Pendulum (Dowsing)
Place your pendulum over each chakra and ask your pendulum for its: direction, size and speed.
Construct your own or use a Chakra chart to determine on which chakra to work on, if it is balanced, under or over energized.
In the same manner you can determine if or what stones or colors may be needed. Go through each of the chakras and make sure that you construct your questions in a way that they can always be answered with a YES or NO.
It is not necessary to do the assessment over the clients body. It can be done over the palm as well. The first chakra can be assessed over the wrist, the second at the thumb, the third over the middle finger, the fourth over a small finger, the fifth over the index finger, the sixth over the ring finger and finally the seventh chakra over the palm.