Furfur Goetia Demon cast seal ring with a gemstone
30) Furfur is a great earle, appearing as an hart, with a firie taile, he lieth in everie thing, except he be brought up within a triangle; being bidden, he taketh angelicall forme, he speaketh with a hoarse voice, and willinglie maketh love betweene man and wife; he raiseth thunders and lightnings, and blasts. Where he is commanded, he answereth well, both of secret and also of divine things, and hath rule and dominion over six and twentie legions.
FURFUR.--The Thirty-fourth Spirit is Furfur. He is a Great and Mighty Earl, appearing in the Form of an Hart with a Fiery Tail. He never speaketh truth unless he be compelled, or brought up within a triangle, . Being therein, he will take upon himself the Form of an Angel. Being bidden, he speaketh with a hoarse voice. Also he will wittingly urge Love between Man and Woman. He can raise Lightnings and Thunders, Blasts, and Great Tempestuous Storms. And he giveth True Answers both of Things Secret and Divine, if commanded. He ruleth over 26 Legions of Spirits. And his Seal is this, etc.
XXXIV. FURFUR, a great earl, appears in the form of a hart, with a fiery tail, and will not open his mouth till compelled within the triangle.* He then assumes the form of an angel, speaking with a hoarse voice. He causes love between man and wife, raises thunder, lightning and great winds, gives true answers about secret and divine things.
*According to Wierus, he will speak outside the triangle, but what he says will be false.