---
product_id: 255063682
title: "GAIN EXPRESS Jeweler High Accuracy Diamond Tester with Ultraviolet UV Light, Professional Portable Gemstone Jewelry Gems Tool"
brand: "gain express"
price: "¥17211"
currency: JPY
in_stock: true
reviews_count: 6
category: "Gain Express"
url: https://www.desertcart.jp/products/255063682-gain-express-jeweler-high-accuracy-diamond-tester-with-ultraviolet-uv
store_origin: JP
region: Japan
---

# Detects diamonds ≥2pt Audible buzzer alerts UV light fluorescence test GAIN EXPRESS Jeweler High Accuracy Diamond Tester with Ultraviolet UV Light, Professional Portable Gemstone Jewelry Gems Tool

**Brand:** gain express
**Price:** ¥17211
**Availability:** ✅ In Stock

## Summary

> 💎 Spot the real sparkle before anyone else does!

## Quick Answers

- **What is this?** GAIN EXPRESS Jeweler High Accuracy Diamond Tester with Ultraviolet UV Light, Professional Portable Gemstone Jewelry Gems Tool by gain express
- **How much does it cost?** ¥17211 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/255063682-gain-express-jeweler-high-accuracy-diamond-tester-with-ultraviolet-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

- • **Instant Confidence:** Audible and visual indicators provide immediate, reliable verification—no guesswork needed.
- • **Portable Powerhouse:** Compact, lightweight design with low battery consumption and optional AC adaptor for extended use.
- • **UV Fluorescence Insight:** Equipped with ultraviolet light to reveal the unique fluorescent reaction of genuine stones.
- • **Custom Calibration Control:** Multi-level volume calibration adapts to different stone sizes for flawless accuracy.
- • **Precision at Your Fingertips:** Quickly distinguishes real diamonds from simulants and metals with advanced sensor tech.

## Overview

The GAIN EXPRESS Jeweler Diamond Tester is a professional-grade, portable tool designed for retail jewelers and pawn brokers. It uses advanced technology including ultraviolet light and multi-level calibration to accurately identify authentic diamonds as small as 2 points, distinguishing them from simulants and metals. Featuring audible and visual alerts, a compact design, and flexible power options, it delivers reliable, fast results to ensure confidence in every gem verification.

## Description

This diamond selector doesn't react on stones like fake crystals, or simulants such as cubic zirconium, when the probe touches the surface. It is the easiest answer for the vast majority of retail jewelers, pawn brokers, and chain stores when faced with the decision of which diamond selector to buy. Why? Because it works reliably and shares the most advanced diamond selector technology on the market.Features:Equipped with ultraviolet light to test the fluorescent reaction of stonesFlexible calibration with multi Level Volume to match different sizes of stonesAn option to use or connect with an A/C adaptor (not included) for long time indoor useMost compact design and low battery consumptionEmit audible sounds to give a warning buzzer if the probe touches a metal surfaceThe audible and visual indicators of genuine diamondWith a single press of a button, it can accurately and precisely: Distinguishes authentic diamond from all models of diamond simulants and metalsDistinguish stones as small as 2ptSupplied with a vinyl pouch, a testing platform for loose stones, and a comprehensive instruction manualBrand new and unusedSpecifications:Probe Warm-up Time: about 25secWorking Time: about 5 hours for continuous useSuggested Working Temperature: 18°C to 30°CWorking Voltage: 1 x 9V, 6F22 battery (included the set) or AC adaptor 110V-240V, DC 9V (not included the set)Size: 168 x 31 x 21mmNet weight: 55gSet includes:1 x Diamond Tester1 x Vinyl Leather Pouch Case1 x Heavy-duty Testing PlatformEnglish Instruction Manual

Review: Can’t tell diamond from moissanite. - This tester can’t tell the difference between diamonds and moissanite.
Review: Very easy to use. Good price.

## Features

- Equipped with Ultraviolet light to test fluorescent reaction of stones
- Flexible calibration with multi Level Volume to match different sizes of stones
- Quickly distinguishes authentic diamond from all models of diamond simulants and metals, Distinguish stones as small as 2pt
- It is the easiest answer for the vast majority of retail jewellers, pawn brokers and chain stores when faced with the decision of which diamond selector to buy
- It works reliably and share the most advanced diamond selector technology on the market

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00MNEB0U0 |
| ASIN  | B00MNEB0U0 |
| Batteries Included? | No |
| Batteries Required? | No |
| Customer Reviews | 3.8 3.8 out of 5 stars (144) |
| Customer reviews | 3.8 3.8 out of 5 stars (144) |
| Date First Available | 1 January 2024 |
| Date First Available  | 1 January 2024 |
| Is Discontinued By Manufacturer  | No |
| Item Package Quantity | 1 |
| Item Weight | 150 g |
| Item model number | JEM-II |
| Item model number  | JEM-II |
| Manufacturer | GAIN EXPRESS |
| Manufacturer  | GAIN EXPRESS |
| Material | Metal |
| Part number | JEM-II |
| Power source type | Battery Powered |
| Product Dimensions | 17.78 x 7.62 x 5.08 cm; 149.69 g |
| Product Dimensions  | 17.78 x 7.62 x 5.08 cm; 149.69 g |
| Style | Compact |

## Images

![GAIN EXPRESS Jeweler High Accuracy Diamond Tester with Ultraviolet UV Light, Professional Portable Gemstone Jewelry Gems Tool - Image 1](https://m.media-amazon.com/images/I/5123qVp9KAL.jpg)
![GAIN EXPRESS Jeweler High Accuracy Diamond Tester with Ultraviolet UV Light, Professional Portable Gemstone Jewelry Gems Tool - Image 2](https://m.media-amazon.com/images/I/617Xh2JHOiL.jpg)
![GAIN EXPRESS Jeweler High Accuracy Diamond Tester with Ultraviolet UV Light, Professional Portable Gemstone Jewelry Gems Tool - Image 3](https://m.media-amazon.com/images/I/61eMZIdgNlL.jpg)
![GAIN EXPRESS Jeweler High Accuracy Diamond Tester with Ultraviolet UV Light, Professional Portable Gemstone Jewelry Gems Tool - Image 4](https://m.media-amazon.com/images/I/713ep6Se39L.jpg)
![GAIN EXPRESS Jeweler High Accuracy Diamond Tester with Ultraviolet UV Light, Professional Portable Gemstone Jewelry Gems Tool - Image 5](https://m.media-amazon.com/images/I/71Il4Tdr3RL.jpg)

## Customer Reviews

### ⭐ Can’t tell diamond from moissanite.
*by A***O on 8 January 2026*

This tester can’t tell the difference between diamonds and moissanite.

### ⭐⭐⭐⭐⭐ Review
*by W***M on 3 April 2025*

Very easy to use. Good price.

### ⭐⭐⭐⭐⭐ Review
*by G***R on 6 July 2025*

Schnell seriös und zuverlässig

## 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.jp/products/255063682-gain-express-jeweler-high-accuracy-diamond-tester-with-ultraviolet-uv](https://www.desertcart.jp/products/255063682-gain-express-jeweler-high-accuracy-diamond-tester-with-ultraviolet-uv)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-01-22*