There are two books that I would recommend and that is The Crystal Bible - Judy Hall & Love is In The Earth - Melody
Here is some information from the Crystal Bible:
Amethyst
has strong healing & cleansing powers and enhances spiritual awareness.
has a sobering affect on overindulgence
it overcomes addictions and blockages of all kinds
extremely beneficial to the mind, calming or stimulating as appropriate.
mentally it helps you feel less scattered and more focused and in control of your faculties.
facilitates the decision-making process, bringing common sense and spiritual insights.
extremely powerful and protective stone with a high spiritual vibration - guards against psychic attack, transmuting the energy into love.
blocks geopathic stress and negative environment energies.
helpful with insomnia cause by an over-active mind and protects against recurrent nightmares. (place under pillow)
etcetcetc
Rose Quartz
stone of unconditional love and infinite peace - teaching true essence of love.
it purifies and opens the heart at all levels, and brings deep inner healing and self-love.
calming and reassuring and excellent use in trauma or crisis.
If you want to attract love, place by your bed or in the relationship corner of your home - it is so effective in drawing love and relationships to you that you often need amethyst to calm things down.
restores trust and harmony in relationships.
strengthens empathy and sensitivity and aids the acceptance of necessary change.
etcetcetc
You will find loads of sites out there, just do some research.
And another method, why not just pick up the respective stone and feel for its properties
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Good Luck!