A diamond tester is a device used to determine whether a gemstone is a real diamond or a simulant (such as cubic zirconia or moissanite). It measures the thermal conductivity of the gemstone, which is a property that differs between diamonds and most simulants.For natural diamonds, heat is conducted quickly through the stone due to its high thermal conductivity, resulting in a rapid response on the diamond tester. In contrast, most simulants have lower thermal conductivity, leading to a slower response or no response at all on the diamond tester.
When it comes to lab-grown diamonds, they are chemically and physically identical to natural diamonds, including their thermal conductivity. Therefore, lab-grown diamonds will respond the same way as natural diamonds on a diamond tester.
It is important to note that a diamond tester is a preliminary tool used for quick identification, but it cannot provide a comprehensive assessment of a diamond's quality or origin. For more accurate and detailed information, lab-grown diamonds, like natural diamonds, can be sent to reputable gemological laboratories for grading and certification.