AT A GLANCE 
 
British designed and engineered diamond tester for highly accurate readings
Main purpose is to detect for diamonds*
Includes a metal alert in case you miss the stone and touch the jewelry surface
Patented Illuminated display panel for easy to view detection results
Audible tone to help quickly identify the test result
Fitted with an integrated microchipped 0.6mm thermoelectric probe
Superior tough retractable tip allowing true contact with the surface of the stone 
Includes a patented 180-degree touch grip assisting to achieve accurate tests
Added feature of an LW395nm Ultra Violet light source for detection of florescence in diamonds. 
Automatic shut down function if you accidently leave it on
Our design allows easy use in either your left for right hand
Produced in house at our British-Chinese owned factory in Shenzhen
Designed and engineered with long standing international technical and design patents
 
Diamond Tester Pen - GemTrue Diamond Plus
Instantly separate diamonds from other white gems with the GemTrue Diamond Plus. This high-end diamond tester uses thermoelectrical technology to distinguish diamonds from other gems. Our diamond tester pen features a straightforward and user-friendly design. This makes the product easy to use for anybody out there. Whether you’re a hobbyist, beginner or professional, or professional this diamond tester is sure to meet your requirements.

With its 0.6mm electrical temperature probe, this diamond tester gives you to highly precise and instant readings. The 180-degree touch grip delivers perfect ground contact between the user’s fingers and the tester for increased accuracy. Simply place the probe onto the gem, and your diamond tester pen will do all the work. You’ll instantly be informed on whether the gemstone that you’re testing is a diamond or not. When it is, the illumination panel of the tester will light up blue. This makes it easy for you to read the test results and recognise a diamond. This tester has a metal alarm built in that eliminates the risk of false readings when you touch the actual surface of the jewellery when testing mounted stones.

The diamond tester itself features a compact and lightweight design. You can easily slide it in your pocket or carry it along in your suitcase. This makes your diamond tester pen a great tool to have at your side during upcoming trade shows, business trips, or supplier visits. The GemTrue Diamond Plus offers comfortable use. The diamond tester pen is fully automatic and requires no manual calibration. It even comes with a built-in UV light that lets you check your diamonds for fluorescence.

This advanced diamond tester can be used by both left and right-handed people. It is powered by a 9V battery and supports a low power alert to make sure you’ll know when to change the battery. The tester requires no waiting time in between the testing of different stones, it allows you to test countless stones in a short period of time. 
*Please note that diamond testers only uses thermoelectrical conductivity it does not resistance test. Because of this, this tester will not able to distinguish natural diamonds from manmade diamonds such as Moissanite or CVD. To do so, you’ll need a multi-tester that uses a thermoelectrical probe. Note that Diamond Moissanite testers are able to differentiate between diamond, Moissanite, CZ, and some other sorts of stones. 
 
*This tester is only for testing diamonds. It will not test Moissanite or other stones. 
 
Specification
Product Dimensions: 150 x 33 x 23mm (6.81 x 1.25 x 0.0.98in)
Product Weight: 80g (0.18lb) weight including battery
Battery Type: 1 x 9v battery
Battery Life: approximately 3 hours of continuous use based on high quality alkaline batteries, continuously using the UV light source will give you approximately 1.5 hours of use
Low Battery Warning: yes
LED Display: yes
Vocal Test Results: yes
Operating Temperature:
Operating temperature: 18°C - 28°C (64°F - 82°F)
Storage temperature: 35°C - 53°C (95°F - 127°F)

Package Content :
1x DK7900 Diamond Tester
1x Metal loose stone holder
1x User manual
1x PU leather carrying pouch
 
Warranty: 1 year from date of purchase.
 
WITH ALL TESTING EQUIPMENT IF YOU ARE UNSURE OF THE TEST RESULTS IT IS RECOMENDED TO MAKE SEVERAL TESTS FOLLOWING THE INSTRUCTIONS GIVEN WITH THE TESTER. IF YOU ARE STILL UNSURE OF THE RESULTS THEN YOU SHOULD CONSULT A PROFFESIONAL GEMMOLOIGIST. GEMTRUE ARE NOT RESPONSABLE FOR ANY DAMAGES OR LOSES THROUGH MISSUSE, INCORRECT TESTING PROCEDURES OR RESULTS. 
 
Please note that if you are purchasing this tester in the UK then it will be the GemTrue Diamond Experior DK8900 that you receive, it is same tester the name just has been changed due to TM in the United Kingdom.