Gem-Stones of the Seven Rays

C. Nelson Stewart wrote about "occult mineralogy" and Baron Edward Bulwer-Litton's interest in the occult. The Gem-Stones of the Seven Rays, Stewart states: "To the ceremonialist and student of magic, precious stones are especially valuable as wave-meters transmitting specialized psychic qualities, and this little book groups some forty-seven mineral species and varieties under the Seven Rays [of life]."