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.
The diamond trading floor that gives all diamond buyers direct access to DCLA guaranteed diamonds from Australian diamond dealers.
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.
Thursday 20 April, 2017
GRAFF UNVEILS 105-CARAT D-FLAWLESS DIAMOND
Graff Diamonds has unveiled the 105.07 carat D flawless pear shaped diamond, it has named the Graff Vendôme after its new retail outlet at Place Vendôme in Paris.
Monday 10 April, 2017
LETSENG MINE YIELDS 114CT. DIAMOND
Gem Diamonds has found a 114-carat rough diamond at its Letšeng mine in Lesotho, the miner reported Friday.
Tuesday 4 April, 2017
SOTHEBY'S SELLS 59.6 CARAT PINK FOR $94.2 MILLION AUD
Steinmetz Diamonds owned by Israeli billionaire Benny Steinmetz, spent two years cutting and polishing the Rough diamond. Which was mined by De Beers in Botswana, Southern Africa.
Thursday 30 March, 2017
DE BEERS, LUK FOOK TO CO-BRAND GRADING REPORTS
Tuesday 21 March, 2017
59.6 CARAT VIVID PINK DIAMOND
Sotheby's plans to auction the famous "Pink Star" diamond an internally flawless, fancy vivid pink stone at its sale in Hong Kong on April 4.
Wednesday 8 March, 2017
GIA FINDS SIGNIFICANT UNDISCLOSED SYNTHETICS
The Gemological Institute of America (GIA) recently uncovered an unusually large number of undisclosed synthetic diamonds mixed in with natural melee diamonds, the lab confirmed with Rapaport News on Monday.