...Philosophically, astrology may be viewed as art rather than science, and the above chart may serve as an example...
Garnet may symbolize Regeneration
Amethyst may symbolize Sobriety
Aquamarine means "Water of the sea" and may symbolize Courage
Diamond may symbolize Everlasting Love
Emerald may symbolize Fertility
Pearl may symbolize Purity
Ruby may symbolize Nobility
Peridot may symbolize Morality
Sapphire may symbolize Wisdom
Opal may symbolize Confidence
Topaz may symbolize Balance
Turquoise may symbolize the Sacred
...Gemstones remind me of stone Mandala's (as well as candy! :)...