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Diamond - Moissanite tester by Presidium, model Adamas

Diamond - Moissanite tester by Presidium, model Adamas

Ref: multi-adamas


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

10X20 loupe by QUICKTEST £ 29.50 incl. VAT

Price: 298.99 (Including VAT)



We are a UK company offering fast delivery and easy telephone support. Free delivery on this item if paid by bank transfer, see details.

Large super-clear bar of LCD lights shows Diamond, Moissanite, Simulant, Metal and Low batt.

Tests the tiniest stones, down to 0.01ct (1pt)

Replaceable tip

Battery or USB power (USB cable supplied).

To see an article all about diamond testing click here.


Very large 'bar graph' display, easy to see, see picture.


Dimensions: 8"X1½"X1" 190X38X28mm

Weight: 110g

Tip: can test stones down to 0.01 carat (1 point) in size; tip is replaceable if broken.

Operating temperature: recommended between 18 and 27 degrees C. (64 to 81 degrees F). But tests show it works fine down to 15 degrees C (50 degrees F.)


Power: three AAA batteries (supplied), or USB cable (supplied)

Warm-up time when switched on: 15 seconds if it's warm, 30 to 40 seconds if it's cool
Warm-up time between tests: 1 to 2 seconds

Power-saving: turns itself off if not used in 90 seconds
Low Battery: low-battery indicator


When connected to a computer, keeps a record of each test result.


Included is a special metal disc against which it can be calibrated. This ensures it's always working correctly. This also means you can calibrate it for hot climates (maximum 27 degrees) or cooler climates (minimum 18 degrees, this being the Chinese idea of "cool").


Cardboard box, but it's a very posh cardboard box.

Stone-holder and calibration disc in main box, instruction book and USB cable in lid.

Batteries included.

{Guarantee / Reliability}

Guarantee: one year

Returns rate (those that are returned to us during the guarantee period): Too few sold to know yet, but Presidium is the most reliable make.


For testing diamonds and Moissanite it's pretty close to 100%, but no tester in existence is guaranteed to give absolutely 100% correct readings every time!

For testing ruby and sapphire, if it reads ruby/sapphire there's a pretty good chance it's ruby or sapphire, but a lot of chrysoberyl and topaz will give the same reading as ruby/sapphire, as will some spinel. To see how the readings of gemstones overlap, see my chart.



Even though it's not designed to work in the cold, it is by far the best of the multi-testers in 'cool' conditions (down to about 15 degrees C). It's by far the nicest design (my opinion), I love the huge bar of lights, very clear to see, and you can, with experience, see how fast the lights move, which makes it very obvious when you have a diamond, even in difficult conditions. Tests the tiniest stones, down to 1pt, smaller than any other tester.


The battery compartment cover is extremely difficult to remove, even when you know how to do it; the little rubber cover over the USB socket falls off; although it's beautifully lightweight, it's large; it doesn't have a carrying case; if it's very cold, it fails to start up. A total non-response indicates 'not diamond', you might be tempted to think it means the tester isn't working.


Technically it's the best of the multi testers; design-wise it's also the nicest despite some minor faults; if you want the overall best tester then this is the one to go for.

Is it worth the extra money (compared with other models)? I can't decide this for you. If jewellery is your business and you are turning over several thousand pounds per day, then this really is not a lot of money to spend on 'the best'. If your dealing in diamonds comprises boot sales plus little bit on eBay…then maybe not.



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!