No. You seal the top part of travertine AFTER it's installed.
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A quadrilateral with both pairs of opposite sides congruent is a parallelogram.
Well they both have four sides. Both are plane shapes (flat; in two dimensions). Both have four equal sides. All that is different is that a rhombus doesn't have to have four equal angles in its corners (even though it can, in which case, that rhombus is also a square).
The opposite sides of a parallelogram are both parallel and equal.
A trapezoid.
They both have two sets of parallel sides, and they both have four right angles.