Damigeron, De lapidibus 7.1-14
The coral stone has the greatest powers in magical usage and in the achievement of serious undertakings. For it is hardy and repels all delusions of dreams by its remedy. It provides the greatest protection (tutamentum) against the wrath of masters when the name of Noctiluca (‘night-shiner’), that is the sign of Hecate, or the face of Gorgo is engraved in it.

The person carrying it is never harmed by any drug (medicamento) nor by lightning nor by a shade sent against them.

In war and in a fight, it is of the greatest assitance. And it will be invincible and efficacious and insuperable, without fear and without sadness, and makes the one holding it safe, easily able to accomplish what they will and gives easy access (to the powerful? into houses?). Furthermore, when it is first consecrated, then ground up, and sown together with corn or barley or any other crop, it keeps hail and all pernicious weather away from the earth. And strewn over vines or olives, it repels all destructive force of winds.

When it is deposited in a house, it protects it from all sorcery (maleficio) and the shades of daemons (umbris daemoniorum) and empty dreams and blasts of lightning.

If you have it with you on a ship, you will accomplish much more, because it resists winds and tempests and whirlwinds. So great is the power allotted to this stone as a remedy against adverse forces (partes).

This protective object (tutamentum) ought to be consecrated by a God and at holy places (sanctis locis), so that it has the greatest effect, day and night, at a dirnual or nocturnal hour. And the stone coral offers good protection (praesidium).