“The marked respect paid by the Buddhists to the sapphire-stone – which was also sacred to Luna, in every other country – may be found based on something more scientifically exact than a mere groundless superstition. They ascribed it to a sacred magical power, which every student of psychological mesmerism will readily understand, for its polished and deep-blue surface produces extraordinary somnambulic phenomena. The varied influence of the prismatic colors on the growth of vegetation, and especially that of the “blue ray”, has been recognized but recently.
The Academicians quarreled over the unequal heating power of the prismatic rays until a series of experimental demonstrations by General Pleasonton, proved that under the blue ray, the most electric of all, animal and vegetable growth was increased to a magical proportion. Thus Amoretti’s investigations of the electric polarity of precious stones show that the diamond, the garnet, the amethyst, are – E, while the sapphire is + E.
Thus, we are enabled to show that the latest experiments of science only corroborate that which was known to the Hindu sages before any of the modern academies were founded.”
H. P. Blavatsky
The Mark Of God: Understanding Your "I AM Presence" 