Monday Mutant 2: Pearls of Wisdom (jigsaw)

Monday Mutants is a series in which I will attempt to experiment with "mutant" puzzles. These could be existing puzzle types with an unusual change in the rules, hybrids combining elements from multiple puzzle types, or puzzle types neither invented nor popularized by Nikoli.
In this Pearls of Wisdom puzzle, you must assemble the grid from the given pieces before you can solve the puzzle. None of the pieces may be rotated, and no two pieces may overlap; the pieces will fill the entire grid. The thick borders on the pieces must coincide with the perimeter of the grid. The rules are otherwise unchanged.