To assist us in holding light in our bodies, God has given to the nature spirits the assignment of forming gemstones in the earth for our use. Twelve of those were on the breastplate of the high priest of Israel, signifying a stone for each of the twelve tribes. Our chakras are also chalices intended to hold and store light, and these are our real spiritual gemstones.
We use gemstones for the same reason that we use technology and scientific instruments: we are at such a level of density in the earth that our bodies are not developed spiritually, nor are they physically light enough to hold the light that we are destined to hold. A gemstone has a molecular structure such that it can store energy which would be too much for our bodies.
So we use them as tools, not superstitiously as amulets. They are a means of storing the energies of our decrees and devotions. And whenever an ascended master may so choose, he may charge or endow a stone with light.
Elizabeth Clare Prophet, October 18, 1987.