Spiritual Science is Practical

Amethyst is the final gemstone of the Apocalyptic ring. Since 610 A.D. it has been the gemstone of the bishop's ring in the Rom...

Carnelian, also called cornelian or sard, is the sixth gemstone. It is a chalcedony coloured by iron hydroxide. The name carnelian stem...

Hyacinth, facing sardonyx in the ring of the twelve gemstones, is a marvellous fiery red, totally transparent stone. In chemical terms ...

Sardonyx , the fifth gemstone, consists of very fine-banded layers of white chalcedony and red carnelian. Already from Roman times, bot...

Chrysoprase, opposite, but really very much opposite emerald, is a totally opaque gemstone, in fact a chalcedony beautifully green co...