There three of those philosophical stones in the occult which are: you guest it, the philopher’s stone Which is the manifestion of the divine particle in the physical
The devil’s stone which originates from ea Koetting which seems to be only the manifestation of things or events without the evocation of spirits and spells, so basically structuring.
The black diamond or adamas ater which is the qlippothic and LHP equilivement of the philosopher stone.
So three gems have their difference indeed, the diamond and the philosopher seem to be double bound together since they are the exact same thing but in a “dark versus light” fashion and the devil’s stone seems to resonate more to spell work and structuring by your mere omnipotence.
My experience with this: not a lot, but I Still consider it the highest achievement out there, even more hard than liberation and enlightenment. I am inclined more to the black diamond notion.
Since you asked about the devil’s stone specifically, EA’s techniques sound similar to what I call “ajna chakra ejaculation” and yes i know that it sounds funny but i use it basically for everything. From evocations to physical manifestion using nothing (no incense, no scrying. Just plain conservation with the spirit like it stands there Infront you) to will imposition.
My technique is first dedication and clarity. To know exactly why you do this, how this could help you in your ascent. After the purpose is set, I generally fast for three days (nethers of the demonic king that I work with)or one week if I am going to evoke the big heads of hell (demonic kings that I path work) but for a simple fulfillment of a desire that I want now, I pretty much do it anytime anywhere.
In the time period between the said start of the process and the end, I dedicate my meditation to the spirit or the thing by first structuring it in my head very clearly and with the power of will and breath i scry it in my physical vision. Then continue my normal meditation, think of this as a warm up before the big workout.
I generally I do not allow any motion in my meditations but in things like this I allow myself to shake. There I call out the name of the spirit for maximum eleven times but mostly I do three or simply do nothing but Keep imagining the thing.
Most meditation practices advise to not force your ajna chakra to opening or give it too much attention, but in this type of thing I had not found any other accepted way to do it. So Indeed I move my focus and my being or the spirit energy that I accumulated my ajna chakra. There I consciously try to “push” “exorcise” or “ejaculate” the energy forth.
At this point you done too much work, allow yourself to be still. Forget the ritual and move on. If it’s a spirit Evocation then I actually observe these two phenomena:
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Mist, there seems to be a moving and moving mist of energy which is the spirit actually moulding it’s force.
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Flashing Spark of Blackness. When I get this phenomena I see a ripple in my vision, a lack of mind processing of reality around me that’s why I see nothing. This ripple flashes with pure light of consciousnesses, this like the mind saying “oh shit, he knows that he observes nothing at all! Quick cover it up” after this spark I generally get instantaneous manifestion that actually remains there watching me for some time.