How Does a Lab-Grown Diamond Tester Work?

What testers measure

Many handheld testers distinguish thermal and electrical properties of diamond versus simulants (such as cubic zirconia or moissanite). They are useful screening tools—not a replacement for a full grading report from an independent lab.

Memorial diamonds

Memorial diamonds grown from personal carbon are real diamonds; testers that confirm “diamond” still do not replace documentation of origin, cut, color, and clarity. Always pair any field test with the certificate your provider supplies.

Learn more on RisenGem

Read Standards & transparency and our process for how we document authenticity end to end.