How can I tell if a tennis bracelet is real?

Whether or not a tennis bracelet is genuine depends on the material. If it’s a diamond bracelet, you can do the breath test. Put the bracelet up to your mouth and breathe on it to fog it up like a mirror. Condensation won't stick to the surface of a diamond, so the fog should clear up within a few seconds. If the condensation lingers, you’re likely looking at a fake. Shop a collection of genuine tennis bracelets from some of the world’s top sellers on 1stDibs.