This image---"the stone that fell from Heaven"---symbolizes the Grail and has many other meanings besides, though perhaps comprehensible only to those initiated into the Mysteries. Which I, of course, am not. Still: I know a bit about alchemical symbols and so on, so I think this image would be of use/interest to someone somewhere.
In any case, I love the look of it: the earthy tones---not colors I often use---and the "metals."
In the center is a stone in charcoal grey embossed in grey with a lotus pattern in a circle of verdigris, that very soft green of weathered copper.. The pattern is surrounded by an eight pointed star (two superimposed squares) which has all sorts of possible alchemical and occult meanings. There's an outer circle in rough bronze with details in blue lapis lazuli. This central image floats in a black void.
The whole is surrounded by a more refined border in copper, gold, lapis and cinnabar.