Crystals are good for energy and meditation, working with them is interesting and there are different crystals/ gem stones for the 7 main Chakras of your body.
Amethyst's are helpful with psychic abilities, they are for
peace and protection, ,they coincide with your 7th Crown Chakra. The birth month of February is associated with Amethysts.
Aquamarine is one of the gems for your 6th Chakra or third eye/brow, and encourages wisdom, truth and intuition. with a birth month of March.
Blue Lace Agate is one of the gem stones for April and the Throat is the 5th Chakra, which is for communication ,self-expression.
Rose Quartz is your 4th Chakra/ Heart, for love ,compassion and joy.
Citrine is your gem stone for the Solar Plexus or 3rd Chakra, and is for trust, self-esteem, personal power. Leo and month August for this Chakra.
The gem Sunstone is one of several for your 2nd Chakra, for power,sexuality ,guilt. for Cancers or scorpios.
The Root or Base Chakras has Red Jasper as one of its stones. Capricorn and associated with survival,tribal issues,security.
So recap... 1-Root - Red
2-Sacral - Orange
3-Solar Plexus - Yellow
4-Heart - Green
5-Throat - Blue
6- Third eye/ Brow - Dark Violet
7-Crown/Top of head - Purple or Clear
Next time I will give you the corresponding oils that can be used when we give Reiki.