The Seven Chakras are seven energy centers of the spiritual body.
This consists of:
1st Chakra - The Base (Root) Chakra
2nd Chakra - The Sacral Chakra
3rd Chakra - The Solar Plexus Chakra
4th Chakra - The Heart Chakra
5th Chakra - The Throat Chakra
6th Chakra - The Third Eye Chakra
7th Chakra - The Crown Chakra
Chakras are the spiritual energy centers that are found within our spiritual bodies and they extend out into the universe.
There are 7 main chakras which are the: Crown, Third Eye, Throat, Heart, Solar Plexus, Sacral and Base or Root Chakra. Different colors vibrate and represent certain chakras.
White and Clear stones are good for the Crown Chakra, Purples are good for the Third Eye, Blues are good for the Throat, Greens and Pinks are good for the Heart, Yellows are good for the Solar Plexus, Oranges are good for the Sacral and Blacks and Reds are good for the Base/Root Chakra.
This is only a brief and simplified introduction to Chakras as it has a rich and deeper history and complexity with many concepts found in the Vedas text from India dating back around 1500 to 500 BC.