system
A chat on 4chan
human
Do you have any resources on gems and their abilities?
gpt
Yeah I just downloaded a bunch of free books on gems and lapidary, and if I have time for it, it only takes a day or two to read a book and take notes on the important parts. 
The older books tend to be better, because they have survived the test of time, and because todays stuff seems like some new age stacey just literally made it all up, despite not being an occultist or meditator. 

The Magic of Jewels and Charms.
The Great Book of Magical Art, Hindu Magic and East Indian Occultism.
Physica - Hildegard von Bingen (this one is interesting because she goes into techniques of faith healing with crystals)
A Lapidary of Sacred Stones (this lists a lot of properties of gemstones engraved with magical images, Picatrix style, although a gemstone will amplify a talisman it is carried with, so there is no need to engrave a gemstone)
The Book of Secrets of Albertus Magnus (some bullshit in here mixed with some truth)
Marcel Vogel - Crystal Basics (some info on charging crystals with your intent)
Jyotish Astrology blogs on planetary gemstones: They will tell you that gemstones function as general planetary talismans all by themselves, although chanting a planetary mantra with the gemstone will imprint very good energy on the gem.
human
Autobiography of a Yogi:
Astrology is the study of man’s response to planetary stimuli. The stars have no conscious benevolence or animosity; they merely send forth positive and negative radiations. Of themselves, these do not help or harm humanity, but offer a lawful channel for the outward operation of cause-effect equilibriums which each man has set into motion in the past. 
The ancient rishis discovered many ways to curtail the period of man’s exile in delusion. There are certain mechanical features in the law of karma which can be skillfully adjusted by the fingers of wisdom.
By a number of means by prayer, by will power, by yoga meditation, by consultation with saints, by use of astrological bangles the adverse effects of past wrongs can be minimized or nullified.
Just as a house can be fitted with a copper rod to absorb the shock of lightning, so the bodily temple can be benefited by various protective measures. Ages ago our yogis discovered that pure metals emit an astral light which is powerfully counteractive to negative pulls of the planets. Subtle electrical and magnetic radiations are constantly circulating in the universe; when a man’s body is being aided, he does not know it; when it is being disintegrated, he is still in ignorance. Can he do anything about it?
This problem received attention from our rishis; they found helpful not only a combination of metals, but also of plants and most effective of all faultless jewels of not less than two carats. The preventive uses of astrology have seldom been seriously studied outside of India. One little-known fact is that the proper jewels, metals, or plant preparations are valueless unless the required weight is secured, and unless these remedial agents are worn next to the skin.