The second-generation automated screening device, AMS2, is designed to automatically feed, handle, and dispense small, polished diamonds in the 0.0033ct (0.9mm diameter) to 0.20ct (3.8mm diameter) size range.

Automated screening for small polished diamonds

The AMS2™ is an automated screening device that verifies natural diamonds. Using the measurement technique of time-resolved photoluminescence, over 99% of natural diamonds will pass and require no further testing. A small number of natural diamonds alongside all laboratory-grown diamonds and diamond simulants will either be categorised or referred for further testing. This instrument is fully automated to feed, measure and dispense into the relevant result bin.
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  • Designed to be used in an environment where loose, polished diamonds are handled.
  • The instrument is ideal for rapidly verifying that your diamonds are natural.
  • It screens melee diamonds in the 0.0033-0.20ct size range.
  • Ideal for checking diamonds before setting in jewellery.
  • Can be used alongside SynthDetect to check diamonds pre and post setting.


  •  Speed: Up to 3600 diamonds per hour
  • Automatically feeds, measures and dispenses your diamonds
  • Can leave the machine running unattended and also overnight – the instrument will automatically stop at the end of the screening run
  • With a low natural diamond referral rate, this reduces the number of diamonds that require further testing
  • NDC Assure Tested AMS2 – Only Natural Diamonds
  • 0% natural diamond false positives

Features and Specifications

  • ~99% colourless/near colourless diamonds passed
  • <1% natural diamonds referred for further testing
  • All laboratory-grown diamonds and simulants categorised
  • Size ranges: RBC = 0.0033–0.20ct
  • Size ranges: Fancy cuts = 0.01–0.20ct
  • Colour range: colourless/near colourless D-J (lower colours may result in higher referral rates)
  • Fully embedded system: No external PC/monitor required.
  • Dimensions: 315mm (w) x 400mm (d) x 550mm (h)
  • 1-year parts and service warranty
  • User training can be specified on request

Learn more about the AMS2 and its capabilities

Have a question? You may find an answer in our FAQs. But you can also contact us by filling the form below.

Learn more about the AMS2 and its capabilities

Have a question? You may find an answer in our FAQs. But you can also contact us by filling the form below.

More Products

Screening of both loose diamonds and jewellery pieces.
Automated Melee screening for the smallest diamonds.
Differentiate laboratory-grown from natural & CVD from HPHT.


Our team of specialised technicians ensure a high standard of product support. Give us a few details and we’ll offer the best solution.

Support for Diamond Verification Instruments


Have a question about the AMS2? You may find your answer below.
No, only the calibration sample supplied with a machine may be used to calibrate it. The calibration sample is marked with the serial number of its associated AMS2 machine and the sample should be kept in a safe place.

In a very small number of diamonds, the spectral information received cannot be used to state categorically that the stone is diamond, and in any such case, the stone is dispensed as non-diamond. There may also be the odd occasion where the diamonds are fed slightly out of position within the machine and may only be partially exposed to the laser light. On these occasions, a non-diamond result might be given for a natural diamond. We recommend that all diamonds dispensed to non-diamond are retested with the AMS2 device at least once, since this may allow a pass result to be achieved.

A powered USB hub can be safely used with the instrument. A non-powered hub can cause the instrument not to function correctly and in extreme cases can cause damage.
No, AMS2 will not screen out treated diamonds. However, all laboratory-grown diamonds and simulants will be screened out.

The quoted feed rate of the AMS2 machine is up to 3,600 diamonds per hour. It is expected the machine will screen diamonds at a feed rate between 3,000 and 3,600 diamonds per hour. If the feed rate drops below this level, there are several factors to consider:

  • Are the environmental limits met? If the humidity is below 45 per cent, the machine may experience a build-up of static electricity charge which can cause the diamonds to feed poorly.
  • Are the diamonds clean? If the diamonds being screened are dirty or greasy, this is likely to cause the machine to feed poorly and the feed rate will reduce.
  • Is the machine clean? Dirt and dust build-up on the disc and guide surfaces of the machine may cause the diamonds to feed poorly. It is recommended to clean the machine before every screening.

At the start of a screening run, the feed rate will be lower while the machine’s stone handling systems fill with diamonds. Similarly, towards the end of a screening run, the feed rate will diminish as the handling systems are starved of diamonds.

Small parcels may have insufficient diamonds to allow the quoted feed rate to be achieved.

There are two ways to start the AMS2 machine: pressing the Start button will complete a Normal start; pressing and holding the Start button will allow the user to select either a Normal or a Fast Start.

A Fast start is optional. This will cause the first stone to be screened more quickly than if a normal start had been selected. When using the touchscreen, pressing the Start button for a second or two will present a menu giving the user the option of a Normal or Fast start. If an external user-supplied mouse is being used, the same effect may be achieved by right-clicking on the Start button.

The Fast start option should not be selected unless the machine is known to be empty. If more than one Fast start is made for a given parcel of goods in the hopper, the machine is likely to become flooded with goods.

The Fast start will not cause the feed rate for the machine to be increased; it simply allows the first stone to be measured more quickly.

If the diamonds being screened are smaller than the stone size that has been selected, the machine will run more slowly than normal; if the diamonds being screened are larger than the stone size selected, the machine may become flooded with diamonds.

Depending on the actual size difference, an increased number of diamonds may be automatically recycled within the machine and may remain unmeasured at the end of a screening run.

Contact Us

Our diamond and technology experts are available for instrument sales, demos and discussions regarding your diamond verification requirements.