---
product_id: 70328834
title: "JZK Portable Electronic Diamond Tester Pen for Diamond, Sapphire, Ruby, Crystal, Agate, Jade, gems Multi Gemstone Precious Stones Hardness Test Tool, Diamond Selector II V2"
brand: "jzk"
price: "€ 31.71"
currency: EUR
in_stock: true
reviews_count: 8
category: "Jzk"
url: https://www.desertcart.fr/products/70328834-jzk-portable-electronic-diamond-tester-pen-for-diamond-sapphire-ruby
store_origin: FR
region: France
---

# 9+ indicator lights for precise gem ID Compact 16x4x2.2cm, lightweight 100g design 9V battery powered for on-the-go testing JZK Portable Electronic Diamond Tester Pen for Diamond, Sapphire, Ruby, Crystal, Agate, Jade, gems Multi Gemstone Precious Stones Hardness Test Tool, Diamond Selector II V2

**Brand:** jzk
**Price:** € 31.71
**Availability:** ✅ In Stock

## Summary

> 💎 Don’t just guess—test like a pro and never miss a real gem!

## Quick Answers

- **What is this?** JZK Portable Electronic Diamond Tester Pen for Diamond, Sapphire, Ruby, Crystal, Agate, Jade, gems Multi Gemstone Precious Stones Hardness Test Tool, Diamond Selector II V2 by jzk
- **How much does it cost?** € 31.71 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/products/70328834-jzk-portable-electronic-diamond-tester-pen-for-diamond-sapphire-ruby)

## Best For

- jzk enthusiasts

## Why This Product

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

## Key Features

- • **Portable & Lightweight:** Compact design fits in your pocket or jewelry kit, perfect for professionals on the move.
- • **User-Friendly Calibration:** Easy probe calibration ensures accurate readings every time, even for non-experts.
- • **Multi-Gemstone Versatility:** One tool tests a wide range of precious stones, eliminating guesswork and costly mistakes.
- • **Professional-Grade Accuracy:** Trusted by gem enthusiasts and managers alike to authenticate valuable stones with confidence.
- • **Instant Gemstone Verification:** Quickly identify diamonds, sapphires, rubies, jade, and more with clear light and beep signals.

## Overview

The JZK Portable Electronic Diamond Tester Pen is a compact, battery-powered device designed to accurately identify diamonds and multiple other precious gemstones through a clear light and beep system. Lightweight and easy to calibrate, it offers professional-grade precision for quick, reliable authenticity testing on the go.

## Description

If the number of lights is equal to or greater than 9, and it beeps, it means the diamond is real. If the number of lights is 9 and it beeps, it means the sapphire is true. If the number of lights is 6.5 to 7, it means the agate is real. If the number of lights 7-8, it means the crystal is real. If the number of lights is 6 to 7, it means that the jade is true. ★ Before the test: 1. Put the battery into the tester. 2. Remove the probe cover. 3. Turn on the switch. 4. Make sure only 1 light lights up on the scale. 5. Make sure the "lamp ready" light is on. 6. (If you test the diamond, then you need to turn on the number of lights corresponding to the inside temperature and weight of the diamond) 7. (If you test other gems, it is best to calibrate the probe before testing, method: placing the probe vertically on a piece of glass, then adjusting the light to 5, and then placing the probe on the gemstone to test) 8. The test is ready. ★ Notice: *No matter what gemstone you are testing, the probe needle and the tested object should be at a 90° angle. *When testing the diamond, your right index finger should keep touching the metal panel on the back of the tester, while you do not touch the panel if you test other gemstones. *Do not test any metal. * Do not use gloves. Product size: 16 x 4 x 2.2 cm. Weight: 100 g. Power required: 1 x 9V battery (not included). The package contains: 1 diamond tester + 1 English introduction + 1 black storage box. If you have any problems with the tests, please contact us, we would love to help you.

Review: Works Perfectly – Tested on a Real Diamond - I tested this diamond tester on a real diamond, and it worked exactly as expected. The results were quick and accurate, and the indicator lights made it very easy to read. It’s lightweight, simple to use, and ideal for checking gemstones like diamonds or rubies at home. For the price, it’s a great little tool that does the job well — definitely worth having if you want to test your jewellery.
Review: I was skeptical due to the price but seems to work fine - Initially I was skeptical due to the very mixed reviews, however my experience of the item was very positive, I tested various stones as per the instructions, I had a ring that looked like diamonds to me but without testing, there was no way to be sure, I first tested items that I knew to be diamonds, followed by stones that obviously were not, the tester was able to confirm my suspicions as per my video that the 3rd item tested does contain diamonds. I think this is a great bit of kit for the money and the case it comes with was also great.

## Features

- Warning:Not suitable for children under 10 years. For use under adult supervision
- This gemstone testing equipment is not only a diamond tester, but also a gemstone tester. It can detect whether a gemstone is real or fake, including: diamond, sapphire, ruby, crystal, agate, jadeite and other gemstones of various sizes.
- *If the number of lights equals or exceeds 9, and it beeps, it means the diamond is real. *If the lights are about 9 and beeps, it means the sapphire is real. *If the number is 6.5-7, it means the agate is real. *If the number is 7-8, it means the crystal is real. *If the number is 6-7, it means the jade is real.
- Before testing: 1. Insert the battery. 2. Remove the probe cover. 3. Turn on 4. Make sure only one light on the scale turns on. 5. Make sure the "lamp ready" light is on. 6. (If you test the diamond, turn on the number of lights corresponding to the interior temperature and weight of the diamond.) 7. (If you test other gems, it is better to calibrate the probe, method: place the probe vertically on the glass, then adjust the light to 5, then test the gems)
- ★ Notice: *No matter what gemstone you are testing, the probe needle and the tested object should be at a 90° angle. *When testing diamond, your right index finger should keep touching the metal panel on the back of the tester, while you do not touch the panel if testing other gemstones. *Do not test any metal. * Do not use a glove.
- Product size: 16*4*2.2cm. Weight: 100g. Power required: 1 x 9V battery (not included). If you have any problems with the tests, please contact us, we would love to help you.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | JZK |
| Model Number | 76166 |
| Package Dimensions | 31.8 x 23.6 x 3.1 cm; 117.93 g |
| Material | Plastic |
| Item Weight | 118 g |

## Images

![JZK Portable Electronic Diamond Tester Pen for Diamond, Sapphire, Ruby, Crystal, Agate, Jade, gems Multi Gemstone Precious Stones Hardness Test Tool, Diamond Selector II V2 - Image 1](https://m.media-amazon.com/images/I/512CcfDiPQL.jpg)

## Questions & Answers

**Q: Can this test semi precious gemstones such as quartz, amazonite, lapis etc?**
A: I always test a diamond first to calibrate it. A lot depends on the temperature in your room and the stone you are testing. Once it is set and your diamond goes into the red, then test your other stones. I have found that if it is a semi precious stone there will be a movement from your starting lights by maybe one or two sections. If however the stone you are testing is glass it doesn't move at all. Cubic zirconium also moves the light. It takes a few goes to  find the right settings each time because of surrounding temperature. Sorry I can't help any further....I am still learning myself!

**Q: Can it identify natural Zircon**
A: My understanding is that it will not specifically identify zircon but would tell you the stone in question was not glass, crystal or diamond. As it works on conductivity I would expect zircon to give a high reading but not as high as diamond.

**Q: What number is for emerald?**
A: I don't know, but the best thing to do would be to find out using a known genuine emerald - someone you know will have one. But remember that apart from diamond, a particular value will only tell you the stone has conductive properties consistent with being an emerald - it would not be a definite identification.

**Q: Can it detect gold chains aswell?**
A: No, it will not detect gold chains since it's a gemstone detector

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works Perfectly – Tested on a Real Diamond
*by D***D on 25 October 2025*

I tested this diamond tester on a real diamond, and it worked exactly as expected. The results were quick and accurate, and the indicator lights made it very easy to read. It’s lightweight, simple to use, and ideal for checking gemstones like diamonds or rubies at home. For the price, it’s a great little tool that does the job well — definitely worth having if you want to test your jewellery.

### ⭐⭐⭐⭐⭐ I was skeptical due to the price but seems to work fine
*by J***R on 24 November 2023*

Initially I was skeptical due to the very mixed reviews, however my experience of the item was very positive, I tested various stones as per the instructions, I had a ring that looked like diamonds to me but without testing, there was no way to be sure, I first tested items that I knew to be diamonds, followed by stones that obviously were not, the tester was able to confirm my suspicions as per my video that the 3rd item tested does contain diamonds. I think this is a great bit of kit for the money and the case it comes with was also great.

### ⭐⭐⭐⭐ Checker
*by M***T on 18 August 2025*

Very accurate work well. Value for money

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*Product available on Desertcart France*
*Store origin: FR*
*Last updated: 2026-01-23*