10 Best Diamond Testers of September 2025

Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones

Presidium

Gemoro Testerossa Diamond, Moissanite & White Sapphire Tester

Gemoro

HMKIS Diamond Tester Pen, High Accuracy Jewelry Diamond Tester＋ 60X Mini LED Magnifying, Professional Diamond Selector for Novice and Expert, Thermal Conductivity Meter

HMKIS

PDMT-A Diamond Mate Electronic Tester A

Presidium

Dupeakya Professional Diamond Tester, Gem Tester Pen Portable Electronic Diamond Tester Tool for Jewelry Jade Ruby Stone

Dupeakya

GemOro Ultratester 3+ Diamond, Moissanite & White Sapphire Tester, Black

Gemoro

PRESIDIUM DIAMONDMATE-C ELECTRONIC DIAMOND TESTER

Presidium

High Accuracy Diamond Tester Professional Diamond Tester Pen Jeweler Tool for Novice and Expert - Diamond Selector II 9V Battery Included(Black Diamond Testers)

Hqdz

HDE Diamond Tester Pen High Accuracy Professional Jeweler for Novice and Expert

HDE

High Accuracy Professional 2pt Jewel Stone Combo Gem Jewelry Jeweler Tester Test Selection Tool Kit selector Meter Device for Diamond Moissanite Metal Gemstone Novice and Expert

TEKCOPLUS