The Prestige Series Diamond Tester incorporates cutting-edge technology that delivers swift and precise readings to differentiate between genuine diamonds and counterfeit stones. Notable features include both automatic and manual operating modes, a linear display for enhanced data visibility, adjustable gain to accommodate small stone sizes, and ambient temperature compensation. Equipped with a rapid warm-up time of merely ten seconds, this portable device operates using a single nine-volt battery (included) and features an auto shut-off function activated by a push button switch. Additionally, the device boasts a unique anti-fade circuit that counteracts stone heating, a low battery indicator for accurate readings, and multipurpose alarms, including an alert indicating readiness, a metal detection signal, and a repetitive beep when testing a diamond.