I was introduced to the art that illustrates this alchemical text through an online prompt and was immediately captivated by its luminous detail, a combinations of everyday life and magical allegory. I got the book out of the library so I could study the art more carefully and get some insight into the meaning of its symbols.
Although the original text is reproduced at the end of the book, I only read the introduction and the commentary for each illustration. The sources for both text and image seem to be a complex combination of alchemical ideas from ancient and contemporary thought, as well as being influenced by Christianity.
Some who study alchemy are primarily interested in its symbolic structure as a method for gaining enlightenment, moving beyond the human limitations of body and mind. Like art and poetry, something that transcends the material world. But the authors of the commentary here want nothing to do with spiritual or psychological interpretations. They take the text and images literally--dismissing both Christian and psychological interpretations, like those of Jung. Because of that literality, the essays mostly failed to hold my interest.
The value of gold is arbitrary, like so many of our measurements and rankings. The Philosopher's Stone seems to me to be merely another fantasy like the Fountain of Youth--one that, if really examined, has no substance beyond vanity. But the images and symbolism of the Splendor Solis are mysterious, and yes, beautiful. They need no gold or promise of eternal life to justify their existence.
Ignore most of the text here, and enjoy the art.