The Diamond Testing meme stems from viral social media clips where jewelers or enthusiasts use a thermal conductivity probe to verify the authenticity of gemstones. In its meme format, the device is applied to various objects, people, or abstract concepts to test their legitimacy or worth. The high-pitched beep of a successful test and the visual indicator of the meter hitting the red zone provide a satisfying, high-energy payoff. It is widely used to celebrate authenticity, call out fake behavior, or create ironic humor by testing everyday items like food or pets.