from what i have learnt about chakras is that they each have their own significant colour or crystals or fragrance.. i hve quite a few chakra sets, i often send them out to friends, and even in all the books i have read, they date back to when anciant times where they found different coloured stones (before known as crystals) that harmonized certain energies in the body in specific places, to my knowledge, this is how they came to use each colour for each chakra.
i'll put the chakras with crystals used and also oils used for aromatherapy.
Soul star which is above the crown, is usually white but ametrine (amethyst/citrine combined in one crystal) can be used enhancing the sprituality through the higher self.
Crown chakra - clear quartz & lavender
Brow chakra (third eye) - amethyst & mandarin
Throat chakra (communication) - blue lace agate & sandalwood
Heart chakra (love & relationships) - pink quartz & PURE rose oil
Navel chakra (solar plexis) - citrine & peppermint
Sexual chakra (sacral) - charnelian & jasmine
Base chakra (root) - red jasper & gingerand/or grapefruit
earth chakra grounds energies - hematite
the kundalini is the chakras within the spine, balance of these particular chakras cannot be restored if the spine is out of alignment.
if you try using the crystals set out in a chakra set, and even the essential oils, you will find a special kind of feelings when you either meditate or just before you go to sleep. you can open your own chakras by verbally telling your chakras to open as you place each one on its right chakra..
grab yourself a chakra kit and give it a try, when i first tried it, i felt some relief and a sense of well being, now, i live by them. my house is full of crystals and most days i have my crystals in my pocket or under my pillow. when my back is sore, i can't use them, because i can't lay flat without dire pain. but i use them as often as i can soemtimes using selotape to hold them in place so i can have them hidden during the day. no one else needs to know you have chakra crystals on you.. or if using the oils. they smell really nice and people will enjoy beign around you :)
it works, try it