The Diamond Certification Laboratory of Australia (DCLA)
Buy and sell diamonds with the help of the experts
The DCLA or Diamond Certification Laboratory of Australia is an independent diamond grading laboratory, and the only diamond grading laboratory in Australia that is internationally affiliated and recognised. Grading is done in accordance with IDC (International Diamond Council) rules.
Mission Statement
DCLA History
Technology & Grading Process
DCLA Laboratory Team
The DCLA is the only internationally affiliated and locally accredited diamond grading laboratory in Australia. Although there are other highly respected laboratories internationally, the DCLA is the only recognised diamond grading laboratory located in Australia, making it easier for Australians to deal with any problems or queries as they arise. In addition, DCLA is the only diamond certification laboratory to stand behind our work and offer a full-replacement Diamond Grading Guarantee.
No, diamond certificates or diamond grading reports produced by people who have a financial interest in a diamond are not independent, and therefore cannot be free of bias.
Ask the jeweller if the diamond certificate comes from an independent diamond laboratory or if it produced by a diamond merchant or retailer, then do your research. Make sure the certificate is issued by the DCLA or another highly respected diamond grading laboratory; DCLA is the only diamond grading laboratory worldwide to offer a full-replacement Diamond Grading Guarantee.
If you were buying a house would you accept an inspection from the owner? Of course you wouldn’t, you would insist that the inspection be done by an expert with no financial interest in the transaction. This situation is the same when buying diamonds. Be careful of diamond reports produced in-house by diamond merchants or retailers, as the report may be inaccurate and overstate the actual grading of the diamond.
Diamond plotting is the process of recording a diamond’s inclusions. At the DCLA, diamond plotting is done on a computer diagram, which is then stored in a database together with all the measurements and features of a diamond. This database is similar to a finger print database, as all diamonds have unique inclusions. The diamond’s plotting is shown on the diamond certificate, and is very important in the identification of a diamond.
It is very important to get the ORIGINAL diamond grading report. Summaries or photocopies are not sufficient, and will not protect you if there is a problem later.
Why do only round brilliant cut diamonds get a proportion grade ?
Well that’s because only round brilliant cut diamonds will have a proportion grade as it is the only diamond shape with scientifically determined parameters.
All other diamond shapes do not have a proportion grade as there are no set parameters, and therefore no standard, to compare different diamonds against.
On the diamond certificate, or diamond grading report, you must look at the proportion grade, polish grade, and symmetry grade.
These three grades together determine the overall make of a diamond, and are each respectively graded as either: Excellent, Very Good, Good, Medium or Poor.
The characteristics section of a Diamond Grading Report will tell you if there are any extra facets, naturals or holes in the diamond.
The nature of diamonds is such that even a very SMALL variation in any of the 4 C’s will have a significant effect on value. To give you an idea of just how sensitive the value of a diamond is to each characteristic, here are some examples (assuming all other characteristics remain constant):
Carat: A difference of 0.1 of a carat (or 0.02 grams) can affect the value of a diamond by as much as 70%.
Colour: A diamond’s colour ranges from D to Z. However the “white” colour range is from D to I (D, E, F, G, H, I). The difference between each colour is very subtle; however a D colour diamond is around 200% more valuable than an I colour diamond. The difference between a D colour diamond and an E colour diamond(which is almost impossible to tell without a set of diamond master stones) can be as much as 40%.
Clarity: Even something as small as a pinpoint, which is only visible under a powerful microscope, can affect a diamond’s value. Each pinpoint could reduce the value of a diamond by 40%.
Cut: Round brilliant cut diamonds are more valuable per carat than other diamond shapes whereas well-made diamonds are worth more than a poorly made diamonds.
The value of the diamond represents between 80 and 95% of the value of a typical diamond ring. Therefore, it is easy to understand why the accuracy of the diamond grading report is so vital and how this knowledge is beneficial to you when you’re looking to purchase your next diamond.