Detection Instruments

The International Institute of Diamond Grading & Research offers detection instruments that can readily screen out simulants, synthetics and treated stones.

Our portfolio comprises of a small suite of products which, when used in combination, considerably reduce the number of stones that would need extensive time-consuming laboratory testing.

Through continued research, development and

innovation, we strive to make our instruments more readily available to all members of the diamond pipeline. This helps to protect consumer confidence in the diamond industry, whilst developing new screening and testing methods to reduce referral rates and increase throughput.

For more information please contact us:

T: +44 (0) 207 858 7887



SYNTHdetect is the latest addition to our range of IIDGR screening and detection instruments.  It is specially designed for testing stones in mounted jewellery but can also be used to test loose stones.

It is suitable for testing colourless to near-colourless stones with no lower size limit.  The various jewellery attachments allow rings, bangles, brooches and necklaces to be tested.  Larger jewellery pieces, along with loose stones can be viewed in the sampling tray.


Diamond Types

Diamonds are separated into two main categories: Type I and Type II.

Type I

These contain nitrogen as an atomic impurity. Type I diamonds can vary from colourless to yellow to brown. These can be further sub-divided into type Ia and Ib.

Type Ia

Groups of nitrogen atoms May be IaA (pairs of N atoms) or IaB (groups of 4 atoms) ~98% colourless/nearcolourless diamonds are a combination of IaA and IaB = IaAB

Type Ib

Contain single isolated nitrogen atoms Yellow to yellow-brown in colour Yellow synthetics fall into this category.

Diamond Types

Type II

Type II diamonds equate to ~1.9% of all gem diamonds. They are also sub-divided into two categories.

Type IIa

Can be colourless or brown. Imperfections in the crystal structure cause the brownish colour. This can be removed via HPHT treatment to improve the colour.

Type IIb

These diamonds are very rare and are grey or blue in colour. Most diamonds are good electrical insulators but the presence of boron makes this type semiconductors.

Simulants, Synthetics and Treated Diamonds

A diamond simulant is any natural or man-made product produced to resemble a diamond. A simulant may be similar in appearance to a diamond, but has different chemical or physical properties.

Cubic Zirconia and Moissanite are both simulants.

AMS2 has the capability to detect simulants and DiamondSure™ will refer all simulants for further testing.

A synthetic shares the properties of diamond but is a man-made product. Unlike a diamond, it is not natural but synthesised in a laboratory in a relatively short time. Synthetics are not new and have been used effectively since the 1950s for industrial and technical purposes. Their growth environment produces differences in the growth structure at atomic level, leading to easy identification with the correct instruments. CVD (Chemical Vapour Deposition) and HPHT (High Pressure High Temperature) stones are both synthetics. User interpretation of DiamondView™ images will give an unambiguous result.

There are many ways of treating a diamond to enhance its colour and clarity; laser drilling and fracture filling for the clarity and coating, irradiation and HPHT treatment for the colour.

Clarity treatments can be easily identified by an experienced gemologist using a loupe or microscope. Most treatments that affect colour result in a ‘fancy’ coloured stone.

For a small percentage of diamonds, HPHT treatment will result in a colourless diamond. These treated diamonds are difficult to identify by eye and require more sophisticated testing. DiamondPlus™ can aid in this testing.

Leading technology in the pursuit of excellence

With laboratories in Antwerp, London and Surat, the International Institute of Diamond Grading & Research provides groundbreaking services using proprietary technology. We aim to bring more consistency, clarity, and integrity to reinforce consumer confidence in the diamond industry.


Diamond Grading

We issue Diamond Grading or Identification Reports for any unset, natural and untreated diamond weighing a minimum of 0.10 carat. We grade diamonds of every clarity from FL through I3 and all colours, D through Y-Z, as well as all fancy colours.


Melee Testing

The International Institute of Diamond Grading & Research is now running a Melee Testing Service specifically set up to support the global diamond industry in the trading of melee category diamonds.


Verification Instruments

Our verification instruments comprise of a suite of instruments, which when used in combination, will considerably reduce the number of stones that would need more time-consuming, extensive laboratory testing.

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