---
product_id: 49635203
title: "GAIN EXPRESS Diamond Tester Pen, Professional Diamond Moissanite Gemstone Tester with UV Ultraviolet Light & Thermal Sensor, Gem Checker Jewelry Tester Diamond Selector for Novice and Expert"
brand: "gain express"
price: "€ 141.29"
currency: EUR
in_stock: true
reviews_count: 10
category: "Gain Express"
url: https://www.desertcart.hr/products/49635203-gain-express-diamond-tester-pen-professional-diamond-moissanite-gemstone-tester
store_origin: HR
region: Croatia
---

# Precision diamond detection Low power, long use UV fluorescence testing GAIN EXPRESS Diamond Tester Pen, Professional Diamond Moissanite Gemstone Tester with UV Ultraviolet Light & Thermal Sensor, Gem Checker Jewelry Tester Diamond Selector for Novice and Expert

**Brand:** gain express
**Price:** € 141.29
**Availability:** ✅ In Stock

## Summary

> 💎 Spot the real sparkle before anyone else does!

## Quick Answers

- **What is this?** GAIN EXPRESS Diamond Tester Pen, Professional Diamond Moissanite Gemstone Tester with UV Ultraviolet Light & Thermal Sensor, Gem Checker Jewelry Tester Diamond Selector for Novice and Expert by gain express
- **How much does it cost?** € 141.29 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/49635203-gain-express-diamond-tester-pen-professional-diamond-moissanite-gemstone-tester)

## Best For

- gain express enthusiasts

## Why This Product

- Trusted gain express brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Complete Pro Kit:** Includes vinyl pouch, testing platform, and detailed manual for novices & pros.
- • **Compact & Power-Efficient:** Lightweight design with low battery consumption and AC adaptor option.
- • **Fluorescent UV Light Sensor:** Reveals gemstone fluorescence for expert-level verification.
- • **Instant, One-Button Operation:** Quickly identifies stones as small as 2pt—no guesswork needed.
- • **Unmatched Authenticity Assurance:** Detects real diamonds vs. moissanite & CZ with pinpoint accuracy.

## Overview

The GAIN EXPRESS Diamond Tester Pen is a professional-grade tool designed for both novices and experts to accurately distinguish genuine diamonds from simulants like moissanite and cubic zirconia. Featuring advanced UV fluorescence testing, thermal sensors, and audible alerts, it offers precise results with a compact, power-efficient design. This all-in-one kit includes essential accessories, making it the ultimate gem verification device for jewelers, pawn brokers, and enthusiasts alike.

## Description

Free delivery and returns on all eligible orders. Shop GAIN EXPRESS Diamond Tester Pen, Professional Diamond Moissanite Gemstone Tester with UV Ultraviolet Light & Thermal Sensor, Gem Checker Jewelry Tester Diamond Selector for Novice and Expert.

Review: Good product for the price. - Very easy to use. Good price.
Review: Good product - Worked better than I thought

## Features

- 💎 Reliable diamond selector: This diamond tester is unresponsive to imitation crystals and simulants like cubic zirconia and moissanite, making it the go-to choice for retail jewelers, pawn brokers, and chain stores.
- 💎 Advanced technology: Equipped with ultraviolet light for fluorescent reaction testing, multi-level volume calibration, and audible warning sounds when the probe touches a metal surface.
- 💎 Convenient features: Compact design, low battery consumption, and the option to use an A/C adaptor for extended indoor use.
- 💎 Accurate and precise: With a single button press, it can identify genuine "natural" diamonds and distinguish stones as small as 2pt.
- 💎 Complete set: Comes with a vinyl pouch, testing platform for loose stones, and a comprehensive instruction manual. Brand new and unused.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00MNEB0U0 |
| Batteries Required? | No |
| Batteries included? | No |
| Battery Cell Type | Alkaline |
| Battery description | Batería 9v |
| Best Sellers Rank | 88,556 in DIY & Tools ( See Top 100 in DIY & Tools ) 182 in Multi Testers |
| Customer Reviews | 3.8 3.8 out of 5 stars (162) |
| Date First Available | 5 Sept. 2014 |
| Item Package Quantity | 1 |
| Item Weight | 150 g |
| Item model number | JEM-II |
| Manufacturer | Gain Express Holdings Ltd. |
| Part Number | JEM-II |
| Power Source | Battery Powered |
| Product Dimensions | 17.78 x 7.62 x 5.08 cm; 149.69 g |
| Style | Compact |

## Images

![GAIN EXPRESS Diamond Tester Pen, Professional Diamond Moissanite Gemstone Tester with UV Ultraviolet Light & Thermal Sensor, Gem Checker Jewelry Tester Diamond Selector for Novice and Expert - Image 1](https://m.media-amazon.com/images/I/5123qVp9KAL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good product for the price.
*by W***M on 3 April 2025*

Very easy to use. Good price.

### ⭐⭐⭐⭐⭐ Good product
*by H***Y on 16 February 2019*

Worked better than I thought

### ⭐⭐⭐⭐ Easy to use
*by W***M on 30 January 2022*

Good materials, look good, easy to use. Just tested on my wife diamond ring, the result is quite good.

## Frequently Bought Together

- Gain Express Diamond Tester Pen, High Accuracy Jewelry Diamond Tester Professional Diamond Selector for Novice and Expert Jewelry Diamond
- Professional Gold, Silver, Platinum Jewelry Testing Kit with Stone Instructions and Box with 30X Eye Loupe Magnifier Precious Metals 10K 14K 18K 24K 999 925 Scrap
- Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones

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**Shop now:** [https://www.desertcart.hr/products/49635203-gain-express-diamond-tester-pen-professional-diamond-moissanite-gemstone-tester](https://www.desertcart.hr/products/49635203-gain-express-diamond-tester-pen-professional-diamond-moissanite-gemstone-tester)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-04-24*