Technology & Grading Process, methods

The Spark of Confidence

Advanced Technology

DCLA prides itself on maintaining a truly state-of-the-art diamond laboratory. Technology is a crucial part of DCLA’s diamond grading and certification capabilities.

DCLA is a full-service diamond grading and testing laboratory, with the most innovative and up-to-date equipment available to accurately identify and assess each diamond.

Each and every diamond is screened for all known treatments, tested to ensure that it is a natural and not man-made diamond, and graded in accordance with International Diamond Council (IDC) rules.

Independence & Quality Control

To ensure a fully objective, independent assessment of your diamond, our diamond graders are protected from potential outside influences. How?

Immediately after a diamond is received, it is placed into a DCLA parcel paper (a “briefca”) and assigned a unique identification number - all reference to the submitting customer is removed. This way, grades cannot be inadvertently influenced by associating a diamond with a particular customer.

In addition, multiple diamond graders work independently on every diamond - no grader can be influenced by the grades of another. Thus, they cannot be influenced by anyone else’s opinion. A minimum of three professionals must independently agree for a diamond’s grades to be finalised by the control grader and forwarded to certificate printing.

In this way, we maintain the integrity of our diamond grading process and are confident in offering our Diamond Grading Guarantee.

DCLA Diamond Grading Process

DCLA has a fully standardised grading process, ensuring that each and every diamond that comes through the laboratory is thoroughly tested for authenticity and graded consistently and accurately according to International Diamond Council (IDC) rules.

Method

Every diamond is:

  • Weighed on a high-precision certified weight scale for exact, accurate weight
  • Measured with specialised computer technology that calculates precise dimensions and proportions
  • Screened for all known treatments and tested to ensure that it is natural and not man-made
  • Colour and fluorescence graded against a set of registered master diamonds, under carefully controlled lighting conditions
  • Clarity-graded under appropriate magnification
  • Plotted for identification purposes under binocular microscopic magnification – a drawing of inclusions is present on every Diamond Certificate
  • Cut-graded for proportions, polish, and symmetry
  • Transparency graded to assess crystal quality

latest news

Wednesday 19 July, 2017

DIAMONDS ARE ALL BILLIONS OF YEARS OLD

How you can re-purpose your existing diamonds.

Thursday 6 July, 2017

ANOTHER LARGE GEM DIAMOND RECOVERED AT LESOTHO MINE

Gem Diamonds found the high quality 126 carat, D colour Type IIa rock at Letšeng.

Monday 12 June, 2017

GEM DIAMONDS FINDS TWO LARGE ROCKS AT FLAGSHIP MINE IN LESOTHO

Africa focused Gem Diamonds has discovered two diamonds bigger than 100 carats at its Letšeng mine in Lesotho, which should help the company boost revenue and investors confidence.

Tuesday 6 June, 2017

KIMBERLEY DIAMONDS CLOSES ITS LAST MINE

Controversial Australia-based miner Kimberley Diamonds has put its last remaining diamond mine into administration after it failed to secure fresh funding.

Monday 5 June, 2017

DE BEERS GOES TO COURT OVER SOUTH AFRICA EXPORT LEVY

De Beers Consolidated Mines (DBCM) is reportedly appealing to the Pretoria High Court in South Africa to set aside a decision by the South African Minister of Minerals Mosebenzi Zwane requiring DBCM to pay a levy on diamonds exported from South Africa to Botswana for the purpose of aggregation.

Thursday 18 May, 2017

DE BEERS TAPS INTO POLISHED DIAMONDS MARKET WITH FIRST-TIME AUCTION

Anglo American’s De Beers, the world’s largest rough diamond producer by value, has decided to begin selling its own polished diamonds in auctions for the first time in its history.

Wednesday 17 May, 2017

SOTHEBY'S SELLS THE APOLLO AND ARTEMIS DIAMONDS FOR £44.9 MILLION