---
product_id: 40181311
title: "Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones"
brand: "presidium"
price: "C$39331"
currency: NIO
in_stock: true
reviews_count: 10
category: "Presidium"
url: https://www.desertcart.ni/products/40181311-presidium-instruments-gem-indicator-pgi-handheld-tester-for-identifying-diamonds
store_origin: NI
region: Nicaragua
---

# USB rechargeable & handheld 31 gemstone types detected Results in <6 seconds Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones

**Brand:** presidium
**Price:** C$39331
**Availability:** ✅ In Stock

## Summary

> 💎 Identify brilliance instantly—because every gem deserves the spotlight.

## Quick Answers

- **What is this?** Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones by presidium
- **How much does it cost?** C$39331 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ni](https://www.desertcart.ni/products/40181311-presidium-instruments-gem-indicator-pgi-handheld-tester-for-identifying-diamonds)

## Best For

- presidium enthusiasts

## Why This Product

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

## Key Features

- • **Instant Gem Identification:** Get precise gemstone results in under 6 seconds—because your time is valuable.
- • **Ergonomic & Portable Design:** Sleek chrome-brushed grip with USB power option—perfect for on-the-go professionals.
- • **Crystal Clear Digital Display:** Easy-to-read LED screen keeps you informed at a glance, even in busy work environments.
- • **Versatile Color Input Function:** Advanced color detection separates gemstones with laser-like precision—no more guesswork.
- • **Unmatched Accuracy with Retractable Probe:** Thin, thermoelectric probe ensures consistent pressure for reliable readings every time.

## Overview

The Presidium Instruments Gem Indicator (PGI) is a professional-grade handheld tester designed specifically for diamonds and 31 common colored gemstones. Featuring a thin retractable thermoelectric probe for enhanced accuracy, a color input function for precise differentiation, and a clear digital LED display, it delivers reliable results in under 6 seconds. Its ergonomic chrome-brushed design and USB power option make it a versatile tool for gemologists and jewelry professionals seeking fast, trustworthy identification on the go.

## Description

desertcart.com: Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones : Arts, Crafts & Sewing

Review: Testing gemstones - Excellent Seller! Purchase a Presidium gemstone tester! I love it! Thank you!
Review: Inaccurate - worked for less than a year before it became unusable - It worked for less than a year. For the price point, it should be way better quality. It now reads “slip detected” constantly - even when it’s not against the stone yet. It’ll provide a reading before the tip has touched the stone. You can test the same stone twice to multiple different results. Save your money & buy any other machine to help you out.

## Features

- INDUSTRIES MOST TRUSTED | The only handheld tester specifically for colored gemstones; Quick results in less than 6 seconds.
- THINNEST RETRACTABLE PROBE TIP | Retractable thermoelectric probe tip that ensures constant pressure between probe and gemstone, for enhanced accuracy.
- VERSATILE AND RELIABLE | Color input function to further separate gemstones for more precise results.
- EASY TO READ | Results are on a clear digital LED screen; Tests an extended range of 31 different gemstones.
- ERGONOMIC | Sleek chrome-brushed ergonomic grip; USB port for alternative power and handheld for convenience.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B06X979666 |
| Best Sellers Rank | #199,088 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #83 in Jewelry Diamond Testers |
| Customer Reviews | 3.8 3.8 out of 5 stars (55) |
| Date First Available | June 3, 2016 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 11.2 ounces |
| Item model number | PGI |
| Manufacturer | PRESIDIUM |
| Package Dimensions | 8.1 x 3.4 x 2.4 inches |

## Images

![Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones - Image 1](https://m.media-amazon.com/images/I/61C6tkCVFKL.jpg)
![Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones - Image 2](https://m.media-amazon.com/images/I/61JEvo5ky6L.jpg)
![Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones - Image 3](https://m.media-amazon.com/images/I/61NiCiPqSeL.jpg)
![Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones - Image 4](https://m.media-amazon.com/images/I/61QeAHxpHML.jpg)
![Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones - Image 5](https://m.media-amazon.com/images/I/61rgbr2vW1L.jpg)

## Questions & Answers

**Q: how does it identify the gemstones as i see nowhere it will show anything in the above photo**
A: You would place the probe tip against the stone you are testing, select the color of the stone in the window, and the tester will identify what it is. The screen is small, but all the information you need will be there

**Q: Where can I find a list of the 31 gemstone this item can detect?**
A: Glass, Iolite, Almandine, Pyrope, Spessartite, Aquamarine, Emerald, Goshenite, Helidor, Morganite, Tanzanite, Nephrite, Peridot, Jadeite, Paraiba, Rubellite, Tourmaline, Demantoid, Hessonite, Tsavorite, Chrysoprase, Amethyst, Aventurine, Citrine, Quartz, Spinel, Chrysoberyl, Topaz, Ruby, Sapphire, Diamond

**Q: Can you test mounted stones?**
A: You can test all kinds of stones! Loose, mounted, cracked, clear and even cloudy!!!

**Q: Can it tell the difference between genuine diamonds and synthetic diamonds ?**
A: Hello,

No, it can not. It simply identifies the stones

## Customer Reviews

### ⭐⭐⭐⭐⭐ Testing gemstones
*by L***. on January 13, 2026*

Excellent Seller! Purchase a Presidium gemstone tester! I love it! Thank you!

### ⭐ Inaccurate - worked for less than a year before it became unusable
*by B***A on August 22, 2025*

It worked for less than a year. For the price point, it should be way better quality. It now reads “slip detected” constantly - even when it’s not against the stone yet. It’ll provide a reading before the tip has touched the stone. You can test the same stone twice to multiple different results. Save your money & buy any other machine to help you out.

### ⭐⭐⭐⭐⭐ A good Useful Tool to have
*by A***A on April 28, 2025*

Great tester, as other reviews have stated You have to have some Knowledge of Gemstones while using this pen which I had no problem with, you can go on the Presidium Website and Download the Spreadsheet of Gems if you’re not sure. As far as Diamond if I wasn’t holding the pen straight and at an angle it would read Sapphire and Ruby, you need to hold the Tester at a straight angle to get an accurate reading, held straight tested for only Diamond. I just wish this one Included an option for testing moissanite!

## Frequently Bought Together

- Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones
- 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 Replacement Probe Pen PS2-2 for Presidium Gem Tester II (PGT II) and Duo Tester II (PDT II)

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*Product available on Desertcart Nicaragua*
*Store origin: NI*
*Last updated: 2026-01-31*