Additional Testing, services

The Spark of Confidence

Colour Authentication

Fancy Coloured Diamonds

The origin of colour in fancy coloured diamonds is of paramount importance to its value. A diamond will either be of natural colour origin as created by nature, or else it has been treated and enhanced by man.

DCLA authenticates all fancy coloured diamonds as natural prior to certification.

DCLA will not issue Diamond Grading Reports for colour treated diamonds.

A preliminary colour authentication service is available upon request.

Colourless Diamonds

Certain “white” diamonds may be enhanced to improve their colour as well. All diamonds that come into the DCLA laboratory are screened for enhancements, and referred for further testing if they do not pass the initial screening. DCLA will only issue a Diamond Grading Certificate for diamonds of natural colour origin.

Synthetic Diamond Identification

All diamonds that come into the DCLA laboratory are screened to ensure that they are natural and not man-made. Diamonds that do not pass the initial screening are referred for further testing.

DCLA will not issue Diamond Grading Reports for synthetic diamonds.

A preliminary synthetic diamond identification service is available upon request.

latest news

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

Wednesday 10 May, 2017

US WOBBLE TAKES SHINE OFF PANDORA SALES

Pandora reported strong growth in the first quarter, but US store closures and sluggish mall traffic dented its performance stateside.

Sunday 7 May, 2017

IMPORTANT ADVICE ON HOW TO SELL YOUR DIAMONDS

If you are you considering selling your diamond, but feel as though you have no idea how or where to begin with the process?

Thursday 4 May, 2017

GEM DIAMONDS RECOVERS 80 CARAT ROUGH DIAMOND

Another D colour Type II diamond weighing 80 carats has been recovered.

Wednesday 3 May, 2017

THIS BLUE DIAMOND IS NATURAL—AND ALSO SYNTHETIC

The good news is, from everything we know, all lab-grown diamonds are detectable, and the detection devices are getting better and (somewhat) cheaper.

Tuesday 25 April, 2017

CHRISTIE’S TO OFFER 92CT. PENDANT

A 92.15 carat diamond pendant worth up to $20 million will lead Christie’s Magnificent Jewels auction in Geneva next month.