Perhaps there is a chemist on Orchid who can put this in the context
of water porosity in general. Is there any stoney or metallic
material which has zero porosity?
My own specific interest is that I have taken up a little outdoor
masonry work as a retirement hobby and already I am contending with
frost-heaving problems. If the liquid water gets into the stones, it
expands when it turns to solid water. Then there is crystal pressure.
As crystals precipitate out in the water and grow they expand and can
turn rock into powder.
This region has had a major quake every 500 years plus volcanic
activity so all rocks have micro and macro fractures.
The answer to your questions about small ring stones, John, will I
expect have more general applicability on a macro scale.
I have never heard any jeweller say to avoid putting rings in water
but I see no reason in theory why the metal and stone of rings could
not absord water under some conditions.
I wonder this. If you take a typical ring plus stone and expanded
the drawing of atoms, molecules and spaces between 1,000x what will
you get? Would it look like what cave explorers see with networks of
caverns and crevaces and tunnels?