Firstly, let us go on the assumption that crystal and rock formations possess not just electromagnetic energies in and of themselves, but also unmeasured and/or un-measurable particles of substance that they radiate and in some way, bring good bearing to various parts of the human body, psyche, spirit, of which we are unaware.

This being based on hundreds of years of belief and the construction of belief systems which contain the belief that certain stones have certain properties which can be of some benefit to man/woman.

The Egyptians, the Jews, the Hindus, the Romans, and on and on, either took certain jewels or stones into battle, used them on wounds, used them to cure various ailments, used them for their particular blessing on a particular thing, such as the body, the spirit, the mind, or particular kinds of events, such as battle, sea voyage, building a home etc...

Considering too, that the earth is bombarded by nutrinos (and I'm using this just as an example to show that there are things going on that most of us don't know of and all of us wouldn't know if had they not been discovered and measured in some way).

The earth is bombarded by 65 BILLION nutrinos per square centimeter PER SECOND which actually PASS THROUGH the earth. Not only that, but, these sub-atomic particles carry no electric charge and are not affected by electromagnetism.

My point is not to go into the physics of nutrinos, or to say they have anything at all to do with gems and stones and how they affect us. The point is to know there are things outside of 'electromagnetic' that have actually been discovered, and are passing through your body right this very moment, at every moment.

With all of this in mind, I think it not necessarily superstitious to believe in the auspicious properties of crystals and other formations that can be worn, even adorned, on the human body.