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QUICKTEST Diamond Tester

QUICKTEST Diamond Tester

Ref: DT-5


10X20 loupe by QUICKTEST £ 29.50 incl. VAT

Gem ID Book (£25.00 instead of £29.50) - £ 25.00

Best Moissanite tester (£42.50 instead of £49.50) - £ 42.50 incl. VAT

Price: 59.50 (Including VAT)



LEDs indicate diamond or not diamond; the diagram printed on the tester shows the actual size of diamonds so that you can easily see how to set the sensitivity before you carry out a test; this is the only tester I have been unable to fool in all conditions: I can't fool it when used in the cold and I can't fool it with my special selection of 'difficult' stones.

Can test small stones

Battery (supplied)

To see an article all about diamond testing click here.


LED display turns blue and bleeps on diamond.


Dimensions: 6¼"X1½"X¾" 155X38X20mm

Weight: 105g

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). But tests show it still works at about 2 degrees C. (36 degrees F).


Power: one PP3 battery (supplied)

Warm-up time when switched on: 20 to 30 seconds

Warm-up time between tests: 1 to 2 seconds


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

Battery included.

{Guarantee / Reliability}

Guarantee: one year

Returns rate (those that are returned to us during the guarantee period): less than 1%.



This really is the only tester that will work in the cold, so if you frequent outdoor fairs and markets in Northern Europe in the winter, this is the one to choose.

Easy-to-understand scale to show you how to set the sensitivity.


This is a diamond-only tester, it will not test Moissanite, that means that a Moissanite will show up as 'diamond' on this tester.


As a reliable diamond-only tester, the DT-5 beats the others hands-down. It's certainly not the cheapest on the market, but if you want the flexibility to test cold stones, and you want reliability, then this is the model I would recommend.


If you are new to gemmology I recommend the book Gem Identification Made Easy. Not only is this a good guide to gemstones, it also has details of every gem tester, including hints, tips and advanced instructions. For more details of this book, click here - special discount price if you add a book when buying this item

Not as detailed, but good guide to gemstones, beautifully illustrated, is Gemstones.

The most basic item of equipment for any jeweller (and especially for buying diamond jewellery) is a jewellers loupe. The best loupe (apart from Zeiss) is the QUICKTEST 10X20, £27.50. Even a beginner will be able to see if a stone is scratched on top and chipped all around the edges (or the edges are worn smooth) or if it is full of bubbles - it will not be diamond, you will not need a diamond tester!