Do true marbles vary much in those areas?

Your site is very informative and much appreciated. I realize you
cannot know every marble by every sales name but I am considering a
beige marble known as tiara beige and wonder if you know anything about
its characteristics? Because it is fairly inexpensive, we wonder if it
is possible that it is of a lower quality, softer, more porous etc.
than other similar marbles like botticcino or broccato. Do true marbles

vary much in those areas?

Thank you
Hope.