--- product_id: 386129511 title: "Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones" brand: "presidium" price: "£387.83" currency: GBP in_stock: true category: "Presidium" url: https://www.desertcart.co.uk/products/386129511-presidium-instruments-gem-indicator-pgi-handheld-tester-for-identifying-diamonds store_origin: GB region: United Kingdom --- # Industry's thinnest 0.45mm probe tip USB & 3xAAA power options Results in <6 seconds Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones **Brand:** presidium **Price:** £387.83 **Availability:** ✅ In Stock ## Summary > 💎 Test smarter, shine brighter—own the gem game with Presidium PGI! ## 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?** £387.83 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/386129511-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 - • **Color-Coded Accuracy:** Select from 12 common colors to fine-tune readings and separate diamonds from 31 other gemstones with confidence. - • **Lightning-Fast Gem ID:** Get precise gemstone results in under 6 seconds—because your time is priceless. - • **Ultra-Slim Probe Precision:** Industry’s thinnest 0.45mm retractable probe tip ensures flawless contact and accuracy on even the tiniest stones. - • **Crystal-Clear Digital Display:** Bright LED screen delivers instant, easy-to-read results that keep you ahead in the gem game. - • **Ergonomic Power & Portability:** Sleek chrome-brushed grip with USB charging and handheld convenience—test anywhere, anytime. ## Overview The Presidium Gem Indicator (PGI) is the industry’s only handheld tester designed specifically for colored gemstones, delivering rapid and accurate identification of up to 31 gem types. Featuring the thinnest retractable 0.45mm thermoelectric probe tip, a color input function for enhanced precision, and a clear digital LED display, it combines ergonomic design with versatile power options including USB and AAA batteries. Ideal for professionals demanding quick, reliable gem testing on the go. ## Description AN INDUSTRY LEADERThe Presidium Gem Indicator, the only handheld tester in the industry specifically for colored gemstones, indicates up to 31 different types of colored gems based on their thermal conductivity and even features a color input function that allows users to select from a range of 12 common colors, thereby achieving more accurate results. With an easy-to-read clear digital LED screen, this smart thermal tester also comes with the Presidium patented refined changeable probe tip, which ensures minimal equipment downtime.The Presidium Gem Indicator is an enhanced and more convenient handheld version of the revolutionary Presidium Gem Tester/Colored Stone Estimator.The Presidium Gem Indicator probe consists of two linked thermometers; one which is heated electronically, while the other is cooled by the gemstone being tested. The difference in temperature creates an electrical output, which is then amplified and displayed on the new digital organic LED display.It is simple to use, easy to maintain and quick in giving you intelligent results about your colored gemstones.The Presidium Gem Indicator (PGI) FeaturesIndustry's thinnest probe tip (0.45mm) for testing gemstones from 0.02ctPatented refined probe tipAlso able to distinguish diamonds from other colored gemstonesSelection of 12 common colors available for more accurate resultsPowered by 3 x AAA alkaline batteries (approximately 3 hours of continuous use)USB port to be used with USB cable and appropriate Presidium Universal USB Power AdaptorIncluded in Your PackagePresidium Gem IndicatorCalibration DiskUSB cableQuick GuideQR Code CardProtective carrying case ## 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 | | Batteries required | No | | Customer Reviews | 3.7 3.7 out of 5 stars (60) | | Date First Available | 24 March 2018 | | Item model number | PGI | | Package Dimensions | 20.57 x 8.64 x 6.1 cm; 318 g | ## Images ![Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones - Image 1](https://m.media-amazon.com/images/I/71SIZ1xbSgL.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 ## 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) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/386129511-presidium-instruments-gem-indicator-pgi-handheld-tester-for-identifying-diamonds](https://www.desertcart.co.uk/products/386129511-presidium-instruments-gem-indicator-pgi-handheld-tester-for-identifying-diamonds) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-30*