Optimum-I is a portable desktop diamond verification instrument for loose and mounted stones designed to separate diamonds from synthetic diamonds and moissanite. Optimum-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 Optimum-I has not been tested under ASSURE 2.0.

Stone Testing Capability

Weight:0.015 ct -10 ct
Size: 1.5 mm-13.5 mm
Colour: D-M
Shape: Round brilliant cut and almost all fancy cuts
Diamond Simulants: Yes, moissanite (not ASSURE Tested)
Mounted Stones: Yes (not yet ASSURE Tested)

Instrument Performance

The below results demonstrate the performance of the OPTIMUM-I with the ASSURE 1.0 Core Sample by a Novice Operator:

Diamond False Positive Rate (optimal rate 0%): 3.5%
Diamond Referral Rate (optimal rate 0%): 4.3%
Diamond Accuracy Rate (optimal rate 100%): 95.7%
Speed (stones tested per hour): 133

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: Yes
Automated Dispense: No
Detect or Refer (Synthetic Diamonds): Detect
Detect or Refer (Diamond Simulants): Detect
Multiple Stones at Once: No
Training Required: No

The user calibrate the tester then place the loose stone on the stone-tray. Touch the ‘START’ button on the screen to start testing then place the probe tip onto the stone within the table facet area of the gemstone perpendicularly and Optimum-I will start testing and interpret the results automatically.

Optimum-I makes a measurement and displays one of the following results:

  1. Diamond
  3. Moissanite

The ‘Type IIa (IaB) refer to lab’ and ‘Need investigation’ results could contain potential synthetic diamonds and diamonds. These referrals should be test further for full verification.

Instrument Specifications

Size: 5.7 cm (W) x 17.75 (D) x 3 cm (H)
Weight: 0.16 kg
Price: $1.190.00 USD (December 2019)

Contact information

+66 080 392 9922

ASSURE Tested October 2020
ASSURE ID: 56104