Diamond Experior
Diamond Experior
Diamond Experior
Diamond Experior
Diamond Experior
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Diamond Experior

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Ref: dt-exp

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(Single item price excluding VAT: £57.29)

Stock: Available

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Pickup available from Quicktest (WD18 8JA)
Email us or call on 01923-220206 for appointment.


Very reliable make, GemTrue.  This is the latest model following on from their Diamond Plus

Automatic display, no need to adjust the sensitivity according to the size of the stone and the temperature, three lights: Diamond (= diamond or Moissanite*) or Other (= not diamond), or Metal (= you've  missed the stones and have touched the setting by accident). 

* This is a diamond-only tester, it does not test for any other stones; this is the simplest type of tester, the manmade stone Moissanite will register as diamond

Guarantee 1 year.

To see an article all about diamond testing click here. 



Three lights, diamondother or metal (see SUMMARY).


Dimensions: 6¼"X1½"X¾" 155X38X20mm

Weight: 80g

Tip: can test stones down to 0.03ct (3pt) in size, smaller if you have good eyesight and a steady hand.

Operating temperature: recommended between 5 and 38 degrees C (41 to 100 degrees F). 


Power: one PP3 battery (supplied)

Warm-up time when switched on: about 20 seconds

Response time (to give a reading) about 1 second

Warm-up time between tests about 1 second.


Small, neat carrying case with stone holder slotted into a side pouch.

Battery included.


This is a diamond-only tester, it will not test Moissanite, that means Moissanite will register 'diamond' (for other models see the ALTERNATIVES tab). 

A UV light serves no purpose when testing diamonds v. non-diamonds (though it does help with testing diamond v. Moissanite in the multi-testers). 


Please note, none of these testers will distinguish natural stones from synthetic stones. "Synthetic" is a scientific term meaning 'made by man in a factory/laboratory to the same formula found in nature'. The two are usually indistinguishable, synthetic diamond is diamond (read about synthetic diamond testers and see our ARI and ARETE models).

The testers below are to distinguish diamond from non-diamond (simulant/imitation).   


Tests mounted stones [1]

Tests  Diamond

Tests  Moissanite

Ruby / 

Other stones

Diamond selector II, (DT-DS-crp) (works some of the time)

Shows up as diamond

No reaction on non-diamond

Diamond selector II  (DT-DS)
(cheap but works most of the time)

Shows up as diamond


No reaction on non-diamond

Diamond Experior (best diamond-only tester) Shows up as diamond Non-diamond reads 'Other Stone'

Moissanite tester by GemVue (Moissanite Plus) MOISS-4)

You must only test stones you are certain are diamond

Multi tester. Experior by Gemtrue (MULTI-EXP)


No reaction on other stones

SAM multi-tester (MULTI-SAM)

Non-diamond reads ‘simulant’

Handheld presidium gem tester (GEMTEST-PGI)

Shows up as diamond

31 stones

Standard Presidium (GEMTEST-P2)

Shows up as diamond

17 stones

Presidium Duo gem tester (GEMTEST-DUO-II)



Digital refractometer by Presidium (REFRACT-DIGI-PRESID)

55 stones

Refractometer (optical not electronic) (Refract-L)

Hundreds of stones [4]

[1] All testers test loose stones but not all can test mounted (set in jewellery) stones.

[2] The probe / analogue meter will test mounted stones, the digital meter will only test loose stones.

[3] The probe / analogue meter: 17 stones; the digital meter: 40 stones.

[4] Skill and practice is required to use an optical refractometer, instructions are not included, see any textbook about gemmology…or the internet.  


Free gift details

If you would like one of the following free gifts with this product, select one from “Select your free gift” above.

Polishing cloth medium-size, approx. 6.5 X 6.5 inches (RRP £1.67 )

Bottle of Isopropyl for cleaning stones (RRP £2.92 )

10X21 loupe (RRP £3.75 )


Ask a Question
  • Does it test for moissanite?

    No. See product description.