What are the 5 C´s
The quality and value of a diamond are judged on five fundamental criteria known as the ‘five C’s.’ The carat-weight, colour, clarity, and cut…and the most important C of all, confidence. Confidence is found in the form of an accurate diamond grading certificate. Some differences in quality are easily noticeable, others need specialist equipment and qualified graders with years of experience to assess and detect. Accurate assessment of a diamond is only possible prior to being set. Once the stone is set even a trained grader cannot precisely determine colour, size and purity clarity. Therefore quality and value can only be estimated. Minor differences in colour, clarity and weight can have a major effect on value. For this reason, laboratories only grade loose diamonds.
In addition to the five C’s, laboratories test for treatments, which enhance the colour and clarity of the diamond. Treatments such as fracture filling, laser drilling and high temperature high pressure, significantly reduce the value of the diamond and should be disclosed.
> Cut
> Colour
> Carat Weight
> Clarity
> Confidence
The diamond trading floor that gives all diamond buyers direct access to DCLA guaranteed diamonds from Australian diamond dealers.
latest news
Friday 20 January, 2012
WORKSHOP: DIAMOND BUYING FOR CONSUMERS
Friday 9th March - Sign up for our 2 to 3 hour hands on workshop and discover what you need to know to buy the right diamond at the right price.
Thursday 19 January, 2012
OPPENHEIMERS SELL DE BEERS DIAMONDS STAKE
South Africa’s Oppenheimer dynasty has ended a century in the diamond business which shaped the region, selling its 40% of De Beers to global miner Anglo American for A$4.91 billion.
Friday 11 November, 2011
DIAMOND BUYING WORKSHOP FOR CONSUMERS
DCLA’s next in-laboratory workshop on ‘How to Buy a Diamond’ is set for Friday December 2.
Thursday 27 October, 2011
FOR JEWELLERS: WORKSHOP FOR DIAMOND SALES STAFF
DCLA diamond experts will walk participants through a diamond course specifically tailored for on-floor sales staff, in a hands on workshop presented at the DCLA Laboratory.
Monday 29 August, 2011
JEWELLERY WORLD
A new jewellery show produced by Jewellery World, Australia’s professional jewellery magazine, and Interpoint Events, an award winning exhibition company, will be launched next year.
Friday 20 May, 2011
DCLA CELEBRATES 10 YEARS
On May 2nd, 2011 The DCLA celebrated ten years in business as one of the world’s leading diamond certification laboratories.
Wednesday 4 May, 2011
AGS LAUNCHES DIAMOND SEARCH PLATFORM
The American Gem Society, in partnership with Verichannel, announced today the launch of a specialized search engine for diamonds graded by AGS Lab, available from AGS suppliers.