---
product_id: 7124422
title: "Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones"
brand: "presidium"
price: "KD 126.71"
currency: KWD
in_stock: true
reviews_count: 13
category: "Presidium"
url: https://www.desertcart.com.kw/products/7124422-instruments-gem-tester-ii-pgt-ii-with-assisted-thermal-calibration
store_origin: KW
region: Kuwait
---

# Identifies 16 gemstone types including diamonds & moissanites Industry’s thinnest retractable probe tip for delicate testing Assisted Thermal Calibration for precise self-tuning Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones

**Brand:** presidium
**Price:** KD 126.71
**Availability:** ✅ In Stock

## Summary

> 💎 Unlock the true value of every gem with precision and ease!

## Quick Answers

- **What is this?** Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones by presidium
- **How much does it cost?** KD 126.71 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/products/7124422-instruments-gem-tester-ii-pgt-ii-with-assisted-thermal-calibration)

## 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

- • **Gemstone Mastery:** Instantly differentiate 16 common gemstones including diamonds and moissanites—your secret weapon for confident buying and selling.
- • **Calibrate Like a Pro:** Self-adjust your tester anytime with Assisted Thermal Calibration (ATC) for flawless accuracy in any environment.
- • **User-Friendly Analog Dial:** Clear, easy-to-read interface means no guesswork—just reliable, consistent results every time.
- • **Precision Meets Portability:** Compact, sturdy design with the thinnest retractable probe tip ensures you test gems safely and on-the-go.
- • **Trusted by Experts & Enthusiasts:** Industry’s most reliable gem tester, perfect for collectors, resellers, and professionals who demand accuracy.

## Overview

The Presidium Instruments Gem Tester II (PGT II) is a compact, battery-powered device featuring Assisted Thermal Calibration for precise self-tuning. It boasts the industry’s thinnest retractable probe tip and can identify 16 types of gemstones including diamonds and moissanites. Designed for professionals and enthusiasts alike, it offers reliable, easy-to-read analog results, making it an essential tool for gem identification and authentication.

## Description

desertcart.com: Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones : Arts, Crafts & Sewing

Review: The perfect tester for us regular folks! - I love this tester and it's easy to use. I am well aware of how delicate the tester point is, so I am VERY careful with it and keep the tip cover on when not in use. This is a great item to have on hand. You can test all the gems you're unsure about... and do the same for your friends. It comes in a nice case and is easy to store. I had a tester for decades before this one, but it just tested diamonds. This one does so much more and the price is so reasonable. Treated right, you will have it for years and years. AND... it's so easy to use!
Review: Works fantastically if you know gems. - We are not new to gemstones. 25+ years experience. We usually test with refractometer, polariscope, spectroscope, etc. but this is portable and customer displayable. It came today and I tested 100 cut stones with 100% accuracy once I calibrated it and got a feel for pressure and 90* angle on the probe. It tested one of my prettiest cut garnets as glass! *^+}{^*! But I put that garnet under the refractometer and it is indeed glass. I hope I didn’t pay much for that rock. This machine tests thermal conductivity. Pretty reliable method to distinguish Glas from precious stone. But; a lot of specimen species have the same thermal conductivity. It’s really good for telling if that ruby ring is a ruby and not garnet or glass. It’s just a starting clue for identifying “what is this random gem?” It calibrates easily. The case isn’t protective enough, especially of the probe. Tools this low price won’t define lab vs natural - need a microscope and skills for that. Overall it’s a great buy at a reasonable price. You don’t become a Graduate Gemologist with one tool but it’s great for buyers, resellers, and collectors to confirm what you’ve got. Easy to use. Performs outstanding. A touch expensive for occasional use. Treat that probe gently, a new on will cost you. Read a book or two if you don’t know that amethyst and citrine are the same mineral species or that sapphire comes in colors. It doesn’t do opal or organics.

## Features

- INCLUDED ASSISTED THERMAL CALIBRATION | Now easily self calibrate your device to your testing environment
- INDUSTRIES MOST TRUSTED | Gemstone tester redesigned to be more compact, sturdy and portable
- THINNEST RETRACTABLE PROBE TIP I PGT II features the industry’s thinnest retractable probe tip
- VERSATILE AND RELIABLE | Consistent and reliable results every time. Identifies diamonds/moissanites
- SIMPLE & EASY TO USE | Clear and easy-to-read analog dial; Can differentiate 16 types of gemstones. IMPORTANT TO NOTE | The calibration of this product may be affected during shipping. If you experience issues with calibration, please reach out to the seller for assistance prior to returning the item.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000TD3G8Q |
| Batteries | 2 AA batteries required. |
| Best Sellers Rank | #8,965 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #4 in Jewelry Diamond Testers |
| Brand | Presidium |
| Color | Presidium Gem Tester Complete Unit |
| Customer Reviews | 4.1 4.1 out of 5 stars (1,296) |
| Date First Available | July 9, 2007 |
| Is Discontinued By Manufacturer | Yes |
| Item Weight | 1.08 pounds |
| Item dimensions L x W x H | 7.8 x 4.5 x 3.8 inches |
| Item model number | PGT-II |
| Manufacturer | Presidium |
| Measurement Type | Thermoelectric probe |
| Power Source | Battery Powered |
| Product Dimensions | 7.8 x 4.5 x 3.8 inches |
| Style | Compact |
| UPC | 798804941239 730792705646 |
| Upper Temperature Rating | 51 Degrees Celsius |

## Product Details

- **Brand:** Presidium
- **Color:** Presidium Gem Tester Complete Unit
- **Item dimensions L x W x H:** 7.8 x 4.5 x 3.8 inches
- **Power Source:** Battery Powered
- **Style:** Compact

## Images

![Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones - Image 1](https://m.media-amazon.com/images/I/51ZVHSzkWcL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: What is the best presidium model?**
A: I have the colored stone estimator model and like it very well. The duo meter is good for follow-up testing of colored stones,also. The main thing to remember is that you have to make several tests to verify a gemstone properly, such as a refractometer, etc. Presidium is top of the line.

**Q: is there one now with a moissanite tester?**
A: Yes that will the  presidium duo model we have it available starting at 349

**Q: does this tool looks like the one on the picture? also does it work well?**
A: Works well

**Q: The red light won't stop flashing to indicate the tester is ready for calibration. What can I try to reset it?**
A: As you stated, the Tester is ready for calibration. Please follow the calibration instructions in the little manual or go to the Presidium website. Good Luck!!!

## Customer Reviews

### ⭐⭐⭐⭐⭐ The perfect tester for us regular folks!
*by L***R on January 9, 2026*

I love this tester and it's easy to use. I am well aware of how delicate the tester point is, so I am VERY careful with it and keep the tip cover on when not in use. This is a great item to have on hand. You can test all the gems you're unsure about... and do the same for your friends. It comes in a nice case and is easy to store. I had a tester for decades before this one, but it just tested diamonds. This one does so much more and the price is so reasonable. Treated right, you will have it for years and years. AND... it's so easy to use!

### ⭐⭐⭐⭐⭐ Works fantastically if you know gems.
*by B***R on June 20, 2024*

We are not new to gemstones. 25+ years experience. We usually test with refractometer, polariscope, spectroscope, etc. but this is portable and customer displayable. It came today and I tested 100 cut stones with 100% accuracy once I calibrated it and got a feel for pressure and 90* angle on the probe. It tested one of my prettiest cut garnets as glass! *^+}{^*! But I put that garnet under the refractometer and it is indeed glass. I hope I didn’t pay much for that rock. This machine tests thermal conductivity. Pretty reliable method to distinguish Glas from precious stone. But; a lot of specimen species have the same thermal conductivity. It’s really good for telling if that ruby ring is a ruby and not garnet or glass. It’s just a starting clue for identifying “what is this random gem?” It calibrates easily. The case isn’t protective enough, especially of the probe. Tools this low price won’t define lab vs natural - need a microscope and skills for that. Overall it’s a great buy at a reasonable price. You don’t become a Graduate Gemologist with one tool but it’s great for buyers, resellers, and collectors to confirm what you’ve got. Easy to use. Performs outstanding. A touch expensive for occasional use. Treat that probe gently, a new on will cost you. Read a book or two if you don’t know that amethyst and citrine are the same mineral species or that sapphire comes in colors. It doesn’t do opal or organics.

### ⭐⭐⭐⭐ Presidium
*by J***O on September 28, 2025*

It is not as accurate as we hoped and the descriptions are not accurate if glass and all the items below it are the same reading and you have to have the batteries in it as well as being plugged in or it will not work. The point of batteries is so it can be used off site for testing items where there may not be electricity, but guess you can use a power pack. I sent pictures of the box before too, it had a small box with the items in it and then no packing to protect it, so it bounced around and had some damage, have not had long enough to know if work properly or not yet due to any damage that may of caused.

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*Product available on Desertcart Kuwait*
*Store origin: KW*
*Last updated: 2026-02-10*