Assure Directory

The Sherlock Holmes Detector by Yehuda

Instrument Description

The Sherlock Holmes Detector is a portable desktop diamond verification instrument for loose and mounted stones. The Sherlock Holmes Detector is designed to separate diamonds from synthetic diamonds. The Sherlock Holmes Detector is manually operated and requires an operator to interpret the test results. The Sherlock Holmes Detector is suitable for an environment where you need to test both mounted and loose diamonds e.g. dealers, diamond and jewellery manufacturers, retailers, pawnbrokers, buyers and gemmological laboratories.

Instrument Specs

Size: 15 cm (W) x 24 cm (D) x 15 cm (H)

Weight: 2.2 kg

Price: 6,495 USD (February 2019)

View Instrument Details

What Stones Can Be Tested?

Weight of stones: All

Size of stones: All

Colour of stones: D-K

Shape of stones: All

Diamond simulants: No

Jewellery: Yes


Capabilities according to Yehuda

Instrument Functionality

Automatically feed the stones? No

Automatically interpret the results? No

Automatically dispense the stones? No

Detect or refer synthetic diamonds? Detect

Multiple stones at one time? Yes

Training? No, review of user manual

How Does it Operate?

The user manually places the loose or mounted stones onto a tray that is placed inside the instrument. To start the testing, the user closes the test chamber and press start. The Sherlock Holmes Detector captures an image and based on visual analysis of the images, and support from a decision tool, the operator concludes the nature of the stones.


The following results can be concluded by the operator based on the data generated by the Sherlock Holmes Detector:

  1. ‘Diamond’
  2. ‘Synthetic diamond’
  3. ‘Refer’


The ‘Refer’ result could contain potential synthetic diamonds and diamonds. Yehuda recommends further testing with regular UV light or by a gemmological laboratory.

What are the Performance Test Results?

The Sherlock Holmes Detector was tested in accordance with the Diamond Verification Instrument Standard with the test protocol for instruments that separate diamonds and synthetic diamonds (Operation Category 1).


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


The Sherlock Holmes Detector was tested with the ASSURE Core Sample that 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.


Sherlock Holmes requires manual interpretation and the instrument was tested both with a novice and a manufacturer appointed expert. The manufacturer appointed an expert from UL’s team. The below results are from the expert tests. Both the novice and the expert test results can be found in the summary report issued by UL.


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


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 n/a
Diamond Accuracy Ratio of diamonds correctly classified as diamonds to the total number of diamonds 97.5%
Speed Stones tested per hour 530
Synthetic Diamond Accuracy Ratio of synthetic diamonds correctly classified as synthetic diamond to the total number of synthetic diamonds 100%
Where Do I purchase the Instrument?

Website: http://www.yehuda.com/

Email: dror@yehuda.com

Phone: +1 800 934 8320

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 The Sherlock Holmes Detector submitted by Yehuda. Please note that the safety testing credentials have not been validated through the ASSURE Program.