Assure Directory

M-Screen+ by HRD Antwerp

Instrument Description

M-Screen+ is a desktop fully automated diamond verification instrument. M-Screen+ is designed to screen large quantities of colourless and near colourless loose stones at a high speed. M-Screen+ automatically separates diamonds from synthetic diamonds and diamonds simulants. M-Screen+ is suitable for large scale diamond wholesalers, diamond cutting and polishing sites, jewellery manufacturers, and gemmological laboratories.

Instrument Specs

Size: 45 cm (W) x 30 cm (D) x 55 cm (H)

Weight: 45 kg

Price: 63,000 USD (February 2019)

View Instrument Details

What Stones Can Be Tested?

Weight of stones: 0.005 ct-0.2 ct

Size of stones: 0.98 mm-3.80 mm

Colour of stones: D-J

Shape of stones: Round

Diamond simulants: Yes

Jewellery: No


Capabilities according to HRD Antwerp

Instrument Functionality

Automatically feed the stones? Yes

Automatically interpret the results? Yes

Automatically dispense the stones? Yes

Detect or refer synthetic diamonds? Refer

Detect or refer diamond simulants? Refer

Multiple stones at one time? Yes

Training? No

How Does it Operate?

The user loads a parcel of loose polished stones into the M-Screen. The stones should be in the range of 0.005 ct to 0.20 ct. The stones in the parcel shall have no bigger difference in diameter than 0.7 mm. The instrument then automatically processes the stones and dispenses them into respective category.


M-Screen+ dispenses the stones into four categories:

  1. ‘Needs rescreening’: stones were not well positioned
  2. ‘100% natural diamonds’,
  3. “Refers”: stones that need further investigation with other instruments because there might be a presence of ‘possible lab-grown and/or colour treated diamonds’
  4. ‘Diamonds out of spec or simulants’


At the end of each screening the results will be automatically summarised in a pdf report.


The refers could contain potential synthetic diamonds and diamonds. The referrals shall be tested further for full verification. HRD Antwerp recommends further testing by a gemmological laboratory.


M-Screen+ is fully calibrated in the workshop of HRD Antwerp. Once installed, the M-Screen+ is immediately ready to start screening.

What are the Performance Test Results?

M-Screen was tested in accordance with the Diamond Verification Instrument Standard with the test protocol for instruments that separate diamonds from synthetic diamonds and diamond simulants (Operation Category 2).


The tests took place at the independent laboratory UL in Canton, Massachusetts, United States.


M-Screen+ was tested with the ASSURE Core Sample that consists of 1,000 diamonds, 200 synthetic diamonds and 200 diamond simulants. The stones are 0.02 ct to 0.20 ct in D-J colour. The below results are from the test with the ASSURE Core Sample.


The tests were performed by a novice operator.


The summary test report issued by UL can be found here.


Diamond False Positive Rate Ratio of synthetic diamonds (and diamond simulants) incorrectly classified as 'diamond' to the total number of synthetic diamonds (and diamond simulants) 0%
Diamond Referral Rate Ratio of diamonds being referred for further testing to the total number of diamonds 4.1%
Diamond Accuracy Ratio of diamonds correctly classified as diamonds to the total number of diamonds 95.9%
Speed Stones tested per hour 12,317
Synthetic Diamond Referral Rate Ratio of synthetic diamonds being referred for further testing to the total number of synthetic diamonds 100%
Where Do I purchase the Instrument?

Website: https://hrdantwerp.com/en

Email: equipment@hrdantwerp.com

Phone: +32 3 222 06 23

Safety Testing

The most important requirement when selecting a Diamond Verification Instrument is that the instrument meets the safety regulations of your local jurisdiction. Before purchasing an instrument, request that the manufacturer verifies that their instrument complies with all regulatory requirements.


Click here to download the safety testing credential for M-Screen+ submitted by HRD Antwerp. Please note that the safety testing credentials have not been validated through the ASSURE Program.