Elena looked at the real pearls, then back at the single plastic bead she’d kept in her pocket—the one that was perfectly round, perfectly smooth, and had done the one thing a real pearl never could: made a loud enough noise to lead everyone home. How to Tell if Pearls are Real - Diamond Nexus

"A trade," Mrs. Sterling said. "For the ones you broke to save us."

The next morning, Mrs. Sterling appeared at Elena’s small apartment. She held a single, gritty, imperfect pearl—one of the few she’d recovered.

"Don't move!" Elena called out. She began tossing her fake pearls toward the sound of Mrs. Sterling’s gasping. "Follow the sound of the plastic!"

The cheap beads bounced loudly on the marble, their light weight making a distinct, hollow clack that the heavy, organic real pearls couldn't mimic. In the dark, the guests used the sound of the bouncing fakes as a trail to find their way toward the emergency exits.

A dozen "real" pearls—heavy, irregular, and priceless—clattered across the floor, vanishing into the shadows.

Elena stood in the drafty aisle of the "Everything for a Dollar" shop, her fingers hovering over a strand of plastic pearls. They were aggressively white, perfectly spherical, and held together by a flimsy thread that looked like it would snap if she breathed too hard. They cost three dollars. She bought them anyway.

Elena didn't panic. She reached up, gave her three-dollar strand a sharp yank, and felt the plastic beads spill into her hand.