Because diamonds are fine conductors of heat, they are tested for authenticity using heat resistance testers. Thermal Conductivity and Electrical Conductivity are the two types of testers used.
Helzberg Diamonds uses Electrical Conductivity to test diamonds for nitrogen, which forms naturally while the stone grows in the earth. However, since certain lab grown diamonds are created from high quality diamond seeds, they may contain less nitrogen as well as trace amounts of boron. This can sometimes cause a false negative. This doesn’t mean the diamond isn’t real; lab grown diamonds are still physically, chemically and optically identical to natural diamonds.
Diamond testers can be misleading. This is why our lab grown diamond center stones are graded by an independent, 3rd party lab (GCAL) to confirm they are, in fact, real diamonds.