Assure Directory

Screen-I by SMARTPRO

Instrument Description


The Screen-I was purchased by the Diamond Producers Association and tested by the independent laboratory UL on behalf of the Diamond Producers Association. ASSURE ID: 55303.


Screen-I is a portable desktop diamond verification instrument for loose and mounted stones. Screen-I is designed to screen out synthetic diamonds. Screen-I is manually operated but gives an automatic test result.


Instrument Specs

Size: 12.6 cm (L) x 7.6 cm (W) x 6.5 cm (H)

Weight: 0.174 kg

Price: n/a

What Stones Can Be Tested?

Weight of stones: 0.01 ct-12 ct

Colour of stones: D-J

Shape of stones: All

Diamond simulants: No

Jewellery: Yes, open back designs


Capabilities according to SMARTPRO’s website

Instrument Functionality

Automatically feed the stones? No

Automatically interpret the results? Yes

Automatically dispense the stones? No

Detect or refer synthetic diamonds? Refer

Multiple stones at one time? No

Training? No

How Does it Operate?

The instrument tests individual stones and automatically displays a test result. The user manually places a loose or mounted polished stone into the Screen-I. To start the testing, the user closes the lid and press the start button. Screen-I automatically presents the test result.


Screen-I displays one of the following results:


  1. Diamond


From the test process, the ASSURE Program has drawn the conclusion that the ‘CVD/HPHT’ results could, despite the labelling, contain synthetic diamonds and natural diamonds, and these have been classified as ‘referrals’. These referrals shall be tested by a gemmological laboratory for full verification.



Screen-I was tested in accordance with the Diamond Verification Instrument Standard with the test protocol for instruments that separate diamonds from synthetic diamonds (Operation Category 1).


The tests took place at the independent laboratory UL in Canton, Massachusetts, United States. The tests were performed by a novice operator. Screen-I was tested with the ASSURE Core Sample.


The UL test summary report can be found here.


ASSURE Core Sample

The ASSURE Core Sample consists of 1,000 diamonds and 200 synthetic diamonds. 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.


Diamond False Positive Rate Ratio of synthetic diamonds incorrectly classified as ‘diamond’ to the total number of synthetic diamonds 0%
Diamond Referral Rate Ratio of diamonds being referred for further testing to the total number of diamonds 10.5%
Diamond Accuracy Ratio of diamonds correctly classified as ‘diamond’ to the total number of diamonds 89.5%
Speed Stones tested per hour 283
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.


The ASSURE Program has no information about the safety credentials of the instrument.