It is important to mention, that even though AMORC does not explorer the symbology of the lamen into their teachings, it has being used as Master and Grand Master pendant since the Order’s inception. In the case of Golden Dawn, the new Adept is required to create their own lamen to be worn during ritual convocations and special ceremonies. For the Golden Dawn it is the mark of the Adept. (Text corrected as suggested in the comments).
Symbolism of the Golden Dawn Rosy Cross
The petals of the rose refer to the twenty-two paths on the Tree of Life and the Twenty-two letters of the Hebrew alphabet. It is the cross in Tiphareth, the receptacle and the center of the forces of the Sephiroth and the paths. The extreme center of the rose is white, the reflected spiritual brightness of Kether, bearing upon it the Red Rose of Five Petals and the Golden Cross of Six Squares; four green rays issue from around the angles of the cross. Upon the white portion of the lamen, below the rose, is placed the hexagram, with the planets.
Around the pentagrams, which are placed one upon each elemental colored arm, are drawn the symbols of the spirit and the four elements. Upon each of the floriated (the arms) of the cross are arranged the three alchemical principles of sulfur, salt, and mercury. The white rays issuing from behind the rose at the inner angles between the arms of the cross are the rays of the divine light issuing and coruscating from the reflected light of Kether in its center; and the letters and symbols on them refer to the analysis of the Key Word - I.N.R.I.