Heliotrope
Heliotrope is of such a nature that if one puts it in a basin of water opposite the sun, it makes the sun become red and creates an eclipse. In a little while it makes the water boil up over the basin's edge, and fall like a shower of rain. He who wears this can prophesy many things. It gives a man praise and good health, it stanches the flow of blood, it overcomes poison and treachery. Any one who takes the herb called heliotrope and binds the two together with the proper incantation can walk where he pleases and no one will see him. This stone comes from Ethiopia, from Cypress, and from Africa. It is very much like the emerald, but has red spots.