Condensation: the innocent liquid that's been known to ruin coffee tables and dinner tables alike. The only way to stop it? Coasters. Crafted from pieces of mother-of-pearl, this set of four coasters is sure to spark conversations in any space.  Beyond decorative, these practical pieces are perfect for preventing water rings from staining your tabletops. Though they'll rock in your own home, these coasters are also a great housewarming gift option.