Screen-I is a portable diamond verification instrument for loose and mounted diamonds designed to separate natural diamonds from synthetic diamonds. Screen-I is manually operated but gives an automatic test result.

The performance metrics shown below are based on testing done in 2019 using the ASSURE 1.0 test standard and sample sets. The Screen-I has not been tested under ASSURE 2.0.

Stone Testing Capability

Weight: 0.01 ct-12 ct
Colour: D-J
Shape: All
Diamond Simulants: No
Mounted Stones: Yes (open back designs, not yet ASSURE Tested)

Instrument Performance

The below results demonstrate the performance of the Screen-I with the ASSURE 1.0 Core Sample:

Diamond False Positive Rate (optimal rate 0%): 0%
Diamond Referral Rate (optimal rate 0%): 10.5%
Diamond Accuracy Rate (optimal rate 100%): 89.5%
Speed (stones tested per hour): 283

The Core Sample consists of 1,000 loose diamonds, 200 loose synthetic diamonds and 200 loose diamond simulants. The stones are 0.02ct to 0.20ct in D-J colour.

Instrument Capabilities

Automated feed: No
Automated results: No
Automated dispense: No
Detect or Refer (synthetic diamonds) Detect
Detect or Refer (diamond simulants) N/A
Multiple stones at once: Yes
Training required: Yes

Screen-I automatically displays one of the following results:

  1. Diamond

‘CVD/HPHT’ result could contain synthetic diamonds and natural diamonds, and these have been classified as ‘referrals’. These referrals should be tested by a gemmological laboratory for full verification.

Instrument Specifications

Size: 12.6 cm (L) x 7.6 cm (W) x 6.5 cm (H)
Weight: 0.174 kg
Price: 549 USD (October 2019)

Contact information
+66 (0) 2 899 2956-7

ASSURE Tested May 2019
ASSURE ID: 55303