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Diamond Tester
The diamond tester offers a quick way to determine whether a gemstone is an actual diamond or an imitation. Especially during sales dialogues for diamonds the diamond tester is the favored equipment due to their facility for a flexible application. Using a procedure that analyzes the heat conductivity, the gemstones can be classified into real diamonds, cubic zirconia and moissanite. Many products of this category areDiamond Tester Calibration purchasable with extensive equipment, like e.g. calibration certificates or even multiple gemmed calibration rings that facilitate as reference stones to calibrate the diamond testers. Most of the diamond testers operate on batteries, so that they support a very flexible and mobile operation for the analysis of diamonds. Operating a diamond tester is mostly very easy and in most cases the diamond testers can be controlled by very few buttons. Many of the diamond testers feature an automatic switch-off and a quick LCD display. From these characteristics results an operation of the diamond testes by anyone, irrespective of their knowledge about the technology. On the contrary, if there are experienced operators, they can even distinct sapphires and rubies from other gemstones by means of the diamond tester. If you can't find the diamond tester you are looking for, please contact us and we will help you find the best solution to suit your needs by calling our offices on: UK customers +44(0) 23 809 870 30 / US customers (561) 320-9162 and our technical staff will advise you regarding our measuring instruments. Our engineers and technicians will be happy to help you with the diamond testers, and of course, with the other products in the field of regulation and control, and scales and balances.

Here you can see diamond testers from these companies:

Diamond Tester by Sauter GmbHDiamond Testers by Bullnheimer GmbH & Co. KG

Technical information about Diamond Testers can be found at the following links:

Diamond Tester JD
  (for authentication of diamonds, with a case made of leather, metal plate for lose stones)

Diamond Tester by Sauter GmbH  Diamond Tester JD for authentication of diamonds, with a case made of leather and metal plate for lose stones  

- Diamond Tester JE
  (for authentication of diamonds and moissanites)

Diamond Tester by Sauter GmbH   Diamond Tester JE for authentication of diamonds and moissanites

- Diamond Tester Diamondmate-A
  (handy diamond tester with digital backlit display and acoustic warning signals)     

Diamond Testers by Bullnheimer GmbH & Co. KG    Diamond Tester Diamondmate-A additionallay with acoustic warnig signal

- Diamond Tester Diamondmate-C
  (diamond tester of the exact same design as Damondmate A, optionally with adapter)

Diamond Testers by Bullnheimer GmbH & Co. KG    Diamond Tester Diamondmate-C optionally with adapter

-  Diamond Tester Duotester
  (measures  heat conductivity and the light refraction as a validation)

Diamond Testers by Bullnheimer GmbH & Co. KG    Diamond Tester Duotester measures also light refraction as validation

- Diamond Tester Multitester III
 (with resilient test probe, multi-site LED display, for gemstones above 0.02 ct)

Diamond Testers by Bullnheimer GmbH & Co. KG    Diamond Tester Multitester III with resilient test probe, for gemstones with more than 0.02 ct

- Diamond Tester Moissanite Tester II
  (for determination of synthetic moissanites, low power consumption)

Diamond Testers by Bullnheimer GmbH & Co. KG    Diamond Tester Multitester II to determine synthetic moissanites, low power consumption

- Diamond Tester Refractive Index Meter II
  (measures refraction index between 1,000 and 3,000, clear read-out)

Diamond Testers by Bullnheimer GmbH & Co. KG   Diamond Tester Refractive Index Meter II measures refraction index between 1,000 and 3,000

- Diamond Tester GEM COMPUTER
  (identifies gemstones and estimates their weight precisely)

Diamond Testers by Bullnheimer GmbH & Co. KG   Diamond Tester GEM COMPUTER to identify gemstones and estimate weight

General information on diamonds and other gemstones
Diamond: A diamond consists of carbon that was exposed to high pressure and therefore is an acknowledged mineral in the mineral classification as a native element. It mostly occurs in an octahedral shape that has often a bent and streaky face. Other habits are for example tetrahedral, dodecahedral and cubic habits. The diamonds are mostly transparent, colorless, or due to small amounts of defects or impurities (e.g. nitrogen) green, yellow, brown or less frequent even orange, blue, purple, red, gray or almost black. A diamond is notably the hardest known mineral and a grade of 10 on the Mohs scale for hardness, and 100 on the Rockwell hardness scale. But the hardness of diamondsDiamond Tester calibration ringDiamond Tester Equipment spreads in-between the different crystal orientations. Therefore it is possible to polish diamonds by means of diamonds stage by stage. The diamond powder that is used therefore, consists of crystals with every possible orientation, thus the powder has even on the hardest crystals an abrasive effect. The weight of crystal is measured and indicated with carat. 1 carat equals 0.2 gram. 
Cubic zirconia: Zirconia is an imitation of a diamond that is often used in the jewelry industry as a competitor to diamonds or for its enhancement. Cubic zirconia is a synthesized cubic crystal form of zirconium(IV)oxide. It was first synthesized in 1937. Due to its immense hardness of 8 – 8.5 on the Mohs scale for hardness and advanced production processes, cubic zirconia became a high-quality, low –cost gemstone and is in great demand as a competitor to diamonds at the jewelry market, though diamonds are much harder.
Moissanite:  Moissanite is a very rare mineral in the mineral class of native elements. It crystallizes in a hexagonal crystal system with the chemical formula SiC and has the shape of evened, rounded, hexagonal crystals with a size of up to five millimeters. The mineral is in its pure appearance transparent. 

Diamond Tester Indication example

In this simulation the principle of the diamond tester and the accordant indication mechanism is displayed. You can recognize at first sight whether the analyzed gemstone is a real diamond or just an imitation. The blue bars of the display indicate a real diamond, whereas if only the red bars lighten up, it is not a pure diamond for sure, but only an imitation. Furthermore the device indicates, when it is turned on and ready to operate.

If you wish to print a selection of the Diamond Testers from our printed catalogue, click the PDF symbol.
Diamond Testers: our printed catalogue.

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If you have any questions, call our offices on:
UK customers +44(0) 23 809 870 30
US customers (561) 320-9162

Below you will find an overview of the different product groups of measuring instruments

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Below you will find an overview of the different product groups of scales and balances

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