Can a jeweler quickly spot a fake diamond?

THE ANSWER

Usually yes. An experienced jeweller can spot most fakes in seconds. Glass feels different under a loupe. It has rounded edges, bubbles inside, and reacts to light differently. Cubic zirconia has more rainbow flash than diamond and weighs noticeably more. Moissanite shows a distinctive doubling effect when viewed through the table. A thermal tester gives an instant reading. It costs little and most jewellers have one on the counter. The one thing a jeweller cannot quickly spot is a lab-grown diamond. That requires specialised lab equipment. But lab-grown diamonds are real diamonds, not fakes. For glass and CZ, a jeweller knows within moments.

NEXT STEP

Read the side-by-side stone comparison to understand the key differences, or browse lab-grown engagement rings if you are ready to start looking at real options.