Diamonds are Forever is a phrase often used with Diamonds.

The world Wide Diamond Lab Certificate is a report created by a team of gemmologists. The diamond is evaluated, measured and inspected using trained eyes, 10 x magnifying glass, a microscope and other diamond industry tools.

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Verify your diamond certificate

About WWDL

World Wide Diamond laboratory offers a wide range of Diamond testing and certification services.

Detailed Diamond evaluation

  • Measured and inspected using trained eyes

  • 10 x magnifying glass

  • Microscope and other diamond industry tools

WWDL Services

Grading, Certification, Quality Insurance and much more, read about all the services we have to offer.


Diamond grading includes an analysis of the diamonds dimensions, clarity, colour, polish, symmetry and other characteristics. Many round diamonds will also include a cut grade on the report.


The World Wide Diamond lab issues diamond grading reports and paper certificates for loose, natural diamonds that weigh 0.50 carats or more in the D-Z colour range and fancy coloured diamonds as well.


If you purchase a diamond based on a certificate from WWDL, you will know in great detail the characteristics of the diamond. Based on this, we can insure that the quality we have specified is also provided.

A smart way to protect your  investment in diamonds

If you invest in diamond grading and obtain a certificate which specificies the characteristics of your diamond, your investment is guaranteed and buyers will purchase your gem more easily.


Countries Worldwide

WWDL is a global organisation based in Amsterdam in the Netherlands, the international Diamond Capitol.

> 125k

certificates issued above .5 carats

Our services are used by diamond buyers, vendors and endcustomers all over the world.


This is the weight of a diamond measured in carats. As the carat weight of a diamond increases so does its rarity and therefore its price. One carat is divided into 100 “points,” (1 Carat = 0.2 Gram) so that a diamond of 75 points weights 0.75 carats. 

  • The carat-weight of a diamond is the easiest measurement to determine.
  • Most importantly, two diamonds can be of equal carat-weight, but their value can differ greatly due to their cut, colour, and clarity.


Every diamond regardless of its shape gets it brilliancy and scintillation by cutting and polishing the diamond facets to allow the maximum amount of light that enters through its top to be reflected and dispersed back through its top.

  • A correctly cut, “well made”, stone is pictured in diagram 1.
  • When a stone is cut too shallow (diagram 2) the light that enters through the top is allowed to escape through the diamond’s bottom.

  • When a stone is cut too deep (diagram 3) the light that enters through the top is allowed to escape through the diamond’s bottom.


Diamonds come naturally in every color of the rainbow. However most people are concerned with diamonds in the white range. The Gemological Institute of America (GIA) rates the body colour in white diamonds from D (colourless) to Z (light yellow).

  • The best color for a diamond is no color at all. A totally colorless diamond allows light to pass through it easily, resulting in the light being dispersed as the color of the rainbow.

  • Colors are graded totally colorless to light yellow. The differences from one grade to the other are very subtle and it takes a trained eye and years of experience to color grade a diamond.


The clarity of a diamond is determined by the amount and location of flaws, or blemishes, in the diamond when viewed under 10 power (10x) magnification. GIA rates clarity grades in diamonds from Flawless to Imperfect 3 (see chart).

  • Most diamonds contain very tiny birthmarks known as “inclusions.” An inclusion can interfere with the light passing through the diamond. The fewer the inclusions, the more beautiful the diamond will be.

  • A diamond that is free of inclusions and surface blemishes is very rare…and therefore very valuable.

Why a diamond report?

The value of a precious stone is determined by its gemological makeup, natural rarity and finished quality. Diamonds and gemstones of similar appearance can have important differences in value. Even experts need powerful analytic tools to detect synthetics, treatments and enhancement processes.

World Wide Diamond Laboratory is one of the most trusted names for the expert and impartial loose diamonds. An authentic WWDL Laboratory Report is the common language of trust and confidence in the gemological world. We take this responsibility very seriously.

Get in touch with WWDL

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