---
product_id: 49635203
title: "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: "R2853"
currency: ZAR
in_stock: true
reviews_count: 11
category: "Gain Express"
url: https://www.desertcart.co.za/products/49635203-diamond-tester-pen-professional-diamond-moissanite-gemstone-tester-with-uv
store_origin: ZA
region: South Africa
---

# Audible alerts for metal contact Detects genuine diamonds vs simulants UV light for fluorescent reaction testing 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:** R2853
**Availability:** ✅ In Stock

## Summary

> 💎 Spot the real sparkle before anyone else does!

## Quick Answers

- **What is this?** 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?** R2853 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/49635203-diamond-tester-pen-professional-diamond-moissanite-gemstone-tester-with-uv)

## 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 pros and novices
- • **Metal Contact Alerts:** Audible warnings prevent false readings on metal surfaces
- • **Compact & Power-Savvy:** Lightweight design with low battery use and optional AC adaptor
- • **Fluorescent UV Testing:** Advanced UV light reveals gemstone authenticity instantly
- • **Precision Diamond Detection:** Pinpoints real diamonds down to 2pt with one-button ease

## Overview

The Diamond Tester Pen is a professional-grade gemstone tester combining UV fluorescence and thermal sensing to accurately identify natural diamonds and distinguish them from moissanite and cubic zirconia. Designed for jewelers and enthusiasts alike, it features audible metal contact alerts, compact portability, and comes with a full accessory kit for precise, on-the-go testing.

## Description

Product Description

Review: Works as it should - Excellent
Review: Easy to use - Good materials, look good, easy to use. Just tested on my wife diamond ring, the result is quite good.

## 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

![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)
![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 2](https://m.media-amazon.com/images/I/713ep6Se39L.jpg)
![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 3](https://m.media-amazon.com/images/I/71Il4Tdr3RL.jpg)
![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 4](https://m.media-amazon.com/images/I/71nSf2iqVDL.jpg)
![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 5](https://m.media-amazon.com/images/I/617Xh2JHOiL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works as it should
*by H***E on 29 March 2026*

Excellent

### ⭐⭐⭐⭐ 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.

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

Very easy to use. Good price.

## 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.co.za/products/49635203-diamond-tester-pen-professional-diamond-moissanite-gemstone-tester-with-uv](https://www.desertcart.co.za/products/49635203-diamond-tester-pen-professional-diamond-moissanite-gemstone-tester-with-uv)

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-08-17*