how does it identify the gemstones as i see nowhere it will show anything in the above photo

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

Where can I find a list of the 31 gemstone this item can detect?

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

Can you test mounted stones?

You can test all kinds of stones! Loose, mounted, cracked, clear and even cloudy!!!

Can it tell the difference between genuine diamonds and synthetic diamonds ?

Hello, No, it can not. It simply identifies the stones

Instruments Gem Indicator Pgi Handheld Tester For Identifying Diamonds Common

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Sold byAmazon IsraelDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💎 Identify brilliance instantly—because your gems deserve the best.

INDUSTRY LEADING ACCURACY - Thinnest retractable thermoelectric probe ensures consistent pressure for unmatched testing precision.
VERSATILE COLOR DETECTION - Advanced color input function separates diamonds from 31 common colored gemstones with ease.
INSTANT GEM IDENTIFICATION - Get precise gemstone results in less than 6 seconds—no more waiting, no more guessing.
ERGONOMIC PORTABLE DESIGN - Sleek chrome-brushed grip with USB power option keeps you testing comfortably anywhere.
USER FRIENDLY DIGITAL DISPLAY - Clear LED screen delivers easy-to-read results, perfect for fast-paced professional use.

The Presidium Instruments Gem Indicator (PGI) is the only handheld tester designed specifically for colored gemstones, delivering fast, accurate results in under 6 seconds. Featuring a retractable thermoelectric probe for consistent pressure, a color input function to distinguish 31 gemstone types, and a clear digital LED display, it combines precision with ergonomic design and USB power flexibility—ideal for professionals who demand reliable, on-the-go gem identification.

Specifications

ASIN	B06X979666
Best Sellers Rank	#311,384 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #110 in Jewelry Diamond Testers
Customer Reviews	3.6 3.6 out of 5 stars (61)
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

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