









💎 Spot the real sparkle before anyone else does!
The GAIN EXPRESS Diamond Tester Pen is a professional-grade gem tester combining UV fluorescence and thermal sensor technology to accurately distinguish natural diamonds from simulants like moissanite and cubic zirconia. Compact and energy-efficient, it features audible alerts, multi-level volume control, and comes with a full accessory kit, making it ideal for jewelers, pawn brokers, and gemstone enthusiasts seeking reliable, on-the-go verification.













| Manufacturer | Gain Express Holdings Ltd. |
| Part Number | JEM-II |
| Product Dimensions | 17.78 x 7.62 x 5.08 cm; 149.69 g |
| Item model number | JEM-II |
| Style | Compact |
| Power Source | Battery Powered |
| Item Package Quantity | 1 |
| Batteries included? | No |
| Batteries Required? | No |
| Battery Cell Type | Alkaline |
| Battery description | Batería 9v |
| Item Weight | 150 g |
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