3rd & 4th Mercury Pentacles Invoke Spirits, Gain Knowledge.
 
Solomon Amulet - Two separate Pentacles of Mercury on each side. Descriptions from the Key of Solomon...
 
The 3rd Pentacle of Mercury - Used to "invoke the Spirits subject unto Mercury; and especially those who are written in this Pentacle". (Most are associated with gaining Knowledge).
 
The 4th Pentacle of Mercury - Used to "acquire the understanding and Knowledge of all things created, and to seek out and penetrate into hidden things; and to command those Spirits which are called Allatori to perform embassies. They obey very readily."
 
Solid pewter, approximately 1 1/4" diameter, comes with cord necklace.