Assure Directory

GIA iD100 by GIA (Gemological Institute of America)

Instrument Description

GIA iD100 is a portable desktop diamond verification instrument for mounted and loose stones. GIA iD100 is designed to separate diamonds from synthetic diamonds and diamond simulants. GIA iD100 is manually operated but gives an automatic test result. GIA iD100 is suitable for an environment where you need to test both mounted and loose diamonds e.g. dealers, diamond and jewellery manufacturers, retailers, buyers and gemmological laboratories.

Instrument Specs

Size: 16.5 cm (W) x 20 cm (D) x 8 cm (H)

Weight: 1.02 kg

Price: 4,995 USD (February 2019)

View Instrument Details

What Stones Can Be Tested?

Weight of stones: 0.005 ct +

Size of stones: 0.90 mm +

Colour of stones: D-J

Shape of stones: All

Diamond simulants: Yes

Jewellery: Yes


Capabilities according to the GIA (Gemological Institute of America)

Instrument Functionality

Automatically feed the stones? No

Automatically interpret the results? Yes

Automatically dispense the stones? No

Detect or refer synthetic diamonds? Refer

Detect or refer diamond simulants? Refer

Multiple stones at one time? No

Training? Yes

How Does it Operate?

The instrument tests individual stones and automatically displays a test result. The user manually places the measurement probe onto the stone and the instrument automatically makes a measurement and displays a result.


The GIA iD100 displays one of the following results:

  1. ‘Pass’
  2. ‘Refer’


The ‘Refer’ results could contain potential synthetic diamonds, diamond simulants or diamonds. These referrals shall be tested further for full verification. GIA recommends further testing by a gemmological laboratory.


Room light calibration is needed upon starting the GIA iD100. At the touch of a button, the system evaluates the existing light in the environment and uses the information to improve the device sensitivity, taking approximately 5 seconds. Calibration is needed once per day or whenever the environmental lighting conditions are changed.

What are the Performance Test Results?

GIA iD100 was tested in accordance with the Diamond Verification Instrument Standard with the test protocol for instruments that separate diamonds from synthetic diamonds (Operation Category 2).


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


GIA iD100 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. Please not that GIA advises that practice with instrument may further improve/minimise refer rates on natural diamonds.


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 3.3%
Diamond Accuracy Ratio of diamonds correctly classified as diamonds to the total number of diamonds 96.7%
Speed Stones tested per hour 183
Where Do I purchase the Instrument?

Website: https://www.gia.edu/id100

Email: giastore@gia.edu

Phone: +1 760 603 4200

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 GIA iD100 submitted by GIA. Please note that the safety testing credentials have not been validated through the ASSURE Program.