To the Diamond Certification Laboratory of Australia

DCLA is Australia’s premier diamond grading laboratory

The DCLA Difference

The Diamond Certification Laboratory of Australia (DCLA) is one of the world’s foremost independent diamond grading and certification laboratories.

Providing independent and only guaranteed diamond grading certificates, or diamond grading reports, for natural and Laboratory Grown diamonds.

DCLA is Australia’s premier diamond grading laboratory, and remains the only internationally recognised diamond certification laboratory in Australia, grading diamonds in accordance with International Diamond Council (IDC) and World Jewellery Confederation (CIBJO) rules for grading polished diamonds.

Protecting Diamond Buyers



The principle mission of the DCLA is to protect diamond consumers, and consumer confidence, when buying diamonds, providing accuracy, consistency and transparency in diamond grading.

The Diamond Certification laboratory of Australia is equipped with the most advanced diamond technology and equipment in Australia.

All diamonds submitted to the DCLA laboratory are individually identified and tested to International Diamond Council standards, ensuring that the diamond has not been treated or enhanced in any way, and are of natural origin.

The DCLA Certificate identifies the diamond is a natural diamond or a man-made synthetic diamond before it is sold by the trade to consumers.

Independent & Accurate Diamond Assessment

DCLA Independence
DCLA Independence means that the DCLA Diamond Grading and Certification Laboratory receives no grants or funding from the diamond or jewellery trade, it is completely self funded and independent.

Trusted and Respected

DCLA is the most respected and trusted name

Most importantly DCLA protects you the diamond jewellery or investment diamond consumer.

Before you buy loose unset diamonds, consult the laboratory for independently certified diamond advice.

If you are in the process of selling diamonds, be sure to contact DCLA for their advice on how to sell a diamond.

DCLA & The International Diamond Council


The International Diamond Council (IDC) is the governing diamond body established by the World Federation of Diamond Bourses (WFDB) and the International Diamond Manufacturers Association (IDMA). Together, these two organisations are the world’s highest authorities in diamonds.

DCLA is the only International Diamond Council (IDC) laboratory and the only CIBJO Diamond Grading laboratory for Australia, and holds the only official registered National Diamond Masterset for Australia, the diamond C2Au set.

DCLA Transparency

What is Transparency?

Transparency, also called pellucidity, is the material property of allowing light to pass through. In mineralogy, another term for this property is diaphaneity.

The DCLA Developed the Transparency Grade System. It is the degree to which a diamond transmits light, directly relevant to its ‘cloudiness’ or ‘haziness.’

In other words, it is a comprehensive assessment of light performance based on the quality of the diamond crystal itself.

Transparency also called pellucidity
Transparency also called pellucidity

The Transparency Grade is standard on the DCLA Diamond Grading Report.

What affects Transparency?

Diamond transparency can be affected in many ways. Certain types of inclusions, such as clouds and twinning lines, structural phenomena such as graining, and even fluorescence can have an impact on a diamond’s ability to transmit light.

That being said, diamonds of any clarity, fluorescence and cut can in fact have Very Good or Excellent Transparency, making them attractive stones. For example, fluorescence can sometimes give a diamond a ‘milky’ appearance, especially when in sunlight…but this is not always the case. It is quite possible for a fluorescent diamond to have Very Good or even Excellent Transparency.

Diamonds of almost any clarity, fluorescence, and cut can also have Good or Medium Transparency – as said, multiple features contribute to a diamond’s transparency.

The unique DCLA Transparency Grading System now takes all of these features into account to provide an even more comprehensive assessment of your diamond.

  • Excellent : Completely transparent, no light interruption, no haze or cloud.
  • Very Good : Transparent, minimal light interruption, very light haze or cloud, difficult to detect.
  • Good : Transparent, some light interruption, slight visible haze or cloud, detectable.
  • Medium : Semi-Transparent, marked light interruption, moderate haze or cloud, easy to detect.
  • Poor : Semi-Transparent, very little light passes through, heavy haze or cloud.

Jewellery Valuation

DCLA Diamond and Jewellery Valuations

DCLA Jewellery Valuations

DCLA Australia’s leading diamond certification laboratory valuation service.

Due to the rates of exchange and the price changes in Diamonds and Gold,  Your Diamond or Jewellery valuations should be updated annually.

A valuations from DCLA laboratory experts is accurate and guaranteed.

Accurate valuations save you money on insurance premiums, keeping you covered in case of a loss, while making sure you receive the same quality diamond or jewellery without compromise.

With a DCLA Diamond Valuation or a Jewellery Valuation  you are guaranteed to get a diamond with the precise quality grade as the stone you insured. It is exact like for like quality.

All Diamond and Jewellery valuations will include personalised optional Cold Laser inscription on the girdle on request.

Insurance Valuations

What is an Valuation and do I need one?

A jewellery valuation is an expert opinion on the current market value of a piece of jewellery. It is important to note that there are many types of valuations and the type and purpose of the appraisal will influence the final value placed on the piece of jewellery. For example an valuation for resale will probably be lower than a valuation for insurance replacement.

The most common purpose of an valuation is for insurance replacement. Most insurance companies require a valuation determine the insurance value and premiums. A valuation also provides a record of the item in case of loss.

It is important to consider that the value that you insure the piece of jewellery for will significantly influence the premium you pay. You should therefore make sure that your valuation closely resembles the cost of replacing the piece in the current marketplace in the event of loss.

What should I expect from my valuation

A valuation for insurance replacement must accurately reflect the cost of replacing the piece of jewellery in the current market with a piece as close to the original as possible.

It is important to be wary of ‘sale’ pricing (Was $5,000 now only $2,000). If you pay $2,000 for a piece of jewellery, it is likely that the current market price is closer to $2,000 than the $5,000 advertised. If your valuation states $5,000, you will be paying a premium based on that value when, in fact, the piece can be replaced for closer to $2,000, and insured at a much lower cost.

The valuation value should also be determined using a standardized, objective process. Because the purpose of the appraisal is for replacement of the piece in the case of loss, there is little scope for subjectivity on determining the current retail market value.

Your valuation should accurately describe the piece of jewellery. It should contain all the information important in determining what you should receive in place of the piece in case of a loss. A photograph of the piece would also be very useful.

Finally, it is important to ensure that you review your valuation regularly to ensure that it reflects the current retail market value and your insurance premium reflects the same.

The nominal cost of keeping your valuation current is far less than the potential cost of over insuring your jewellery or being under insured.

Why should I get a DCLA Jewellery valuation?

Objectivity and Accuracy

The DCLA valuation process is entirely objective. The value of the piece is based on the specific details of the materials used in making the piece, current market resource prices (price of diamonds, gold, other precious metals and stones) and comprehensive, statistical market data. This ensures an accurate retail replacement value in the current market. The appraisal value is also regularly reviewed to determine if it has changed significantly since the original appraisal. You will be notified of any changes that may affect your insurance premiums.

A DCLA valuation will also have printed on it a photograph of the piece (subject to retailers providing the photograph) which will help in insuring correct insurance replacement in the event of a loss.


DCLA is completely independent from the retail jewellery stores and valuers. We receive a small fee from the retailers for the production of each valuation. That fee is in no way related to the value determined by our valuation system.

Convenience and security

Your valuation is stored in our secure database. The database has multilevel security and redundancy to protect the information. This means that your information is safe, secure and private. It also means that it is available, online, to you at any time. You never need to take your piece into a jewellery store again to have it revalued. This can all me done quickly and easily online.

If, for example, your valuation certificate is lost together with your jewellery in a house fire, DCLA can quickly and easily provide you with a copy for your insurance claim.

As an added bonus, each DCLA valuation is available with two copies, one for you and one for your insurance company if required. This saves you the effort involved in getting a certified copy of the original valuation for your insurance application.

This is another assurance linking your diamond to the report or the Diamond or Jewellery Valuation, identifying your diamond to the Valuation or Diamond Grading Report  in case of recovery.

Rough Diamonds

Rough or Uncut Diamonds

Rough uncut diamond

DCLA offers the only qualified service for rough diamonds direct from our South African DCW. Our diamond expertise in the DCW (Diamond Cutting Works) is third generation.

We are experts in the field of:

  • Marking, cleaving, laser or conventional sawing.

Our services included:

  • Rough diamond pricing on individual single large crystals or parcels of small rough or run of mine.
  • Classification of rough parcels of diamonds for colour and clarity.
  • Expected weight recovery of rough diamonds, for rounds or fancy shapes.
  • Pricing of industrial, near gem and gem quality diamonds.
  • Sorting of near gem rough, and their market price.

Production services:

  • Calculation of the retention on all shapes including octahedrons and misshapen crystals, with a predicted accurate expected weight.
  • Opening windows on rough diamonds, for marking and internal assessment of depth and sizes of inclusions.
  • Cutting and Polishing rounds and fancy shapes.

Fancy colours:

  • Identifying natural origin, colour banding, zoning within rough diamond crystals of fancy colours.
  • Proportion and expected angles for light reflection and colour intensifying the natural colour in the crystal.

When buying or selling Rough diamonds call the DCLA for all Rough Diamond related information.

Diamond Buying or Selling

Diamond Buying And Selling Tips

You may experience uncertainty when purchasing a diamond, particularly an engagement diamond. This is not unjustified with the increased incidence of treated diamonds, synthetic diamonds and diamond simulants, no to mention incorrectly certified or graded diamonds.

Some Quick Tips

  • Buy from a reputable jeweller. A reputable jeweller sells with genuine Diamond Grading Reports or Certificates.
  • Buy with a diamond grading report or certificate from an independent and recognised diamond grading laboratory. This ensures you have a natural, untreated diamond that has been graded accurately. DCLA is the only independent and internationally recognised laboratory in Australia.
  • Note that a “valuation” or “appraisal” is NOT a certificate.
  • Read the certificate carefully to ensure that you make an informed decision
  • Price comparison is only possible if you are comparing certified diamonds. Diamond Grading Reports and Certification allows you to compare prices without unknowingly sacrificing quality or natural origin.
  • Be cautious of “sales” which appear to be genuine but are nothing more than a large discount off an inflated price. If it seems to good to be true, it probably is.
  • Be cautious of internet retailers offering a huge selection of diamonds. Often many are not available – this is a classic baiting scam.
  • Buy a diamond that is cold laser inscribed. This identifies the diamond and ensures you get the one described by the diamond’s report or certificate.
  • Do not buy your diamond overseas, buy locally. This ensures you have recourse if anything is wrong.
  • Diamonds are priced the same way worldwide -there are no cheap diamonds, only lower quality.
  • Never buy a diamond without seeing it first. The internet has become the perfect marketplace for selling the “leftovers,” which are impossible to sell for the asking price through traditional diamond channels.
  • Do not buy a diamond with a bogus or in-house diamond “certificate”. If you are unsure, do your research on the laboratory that issued the diamond grading report. Examples of in-house “certificates” are manufacturer reports and appraisals generated by the seller.
  • The seller’s valuation or certificate it is not independent and may be overstated. Genuine diamond grading laboratories do not sell diamonds nor do the employees have any interests in the jewellery trade, as this represents a significant conflict of interest.
  • Do not accept unknown diamond certificates or photocopies of the original diamond grading report or certificate.
  • Never shop based on price alone – this generally results in a lower quality, not a better deal. Generally speaking, you will get what you pay for.

Knowledge is key to any decision. Certification is vitally important to ensure you make an informed diamond purchase.

For more information, feel free to contact the DCLA on our Diamond ‘Trustline,’ established as a hotline for all of your diamond inquiries.

When Trading or Selling a Diamond

DCLA can help you sell or auction your diamond jewellery and get you the correct value:

DCLA Laboratory Diamond Selling Advice

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

This article will give you a few tips to help you along the way.

TIP #1 Diamonds are usually given to display love, making the sentimental value higher to the seller than the actual value to a buyer. Should you be in the market to sell your diamond, make sure you are ready to part with the diamond before beginning the process.

DiamondView DTC Natural Diamond Testing

TIP #2 Be sure of the quality and authenticity of what you are trying to sell. Make sure of the quality and the grade of the stone. This is most important for the ultimate value of the diamond. There have been many instances where a seller is committed to selling their diamond only to find out the quality isn’t as described when originally purchased.

Sarine Diamond Proportion and Symetry Grading

There are Jewellers or services available, who will give an unbiased assessment of your stone. But it is far more valuable in the long run to get a report from a recognised Laboratory.

It is also recommended to verify the report matches the Laser inscription before placing your diamond on the market, to assure your diamond is the same stone should it not sell.

TIP #3 Now that you have an accurate report of the quality, make sure you get a realistic selling value. Believing the diamond holds a higher value than it truly possesses will lead to a challenging, frustrating experience which can be dragged out.

An appraiser can assist you with determining a fair selling, price so you can avoid this pitfall. Diamonds are priced in US dollars, so your diamonds price will be affected when converted to your local currency.

A good way to see current retail values is to visit online stores like www.dcladiamondexchange.com.au.

TIP #4 There are many ways to sell a preloved diamond or diamond jewellery. Research your selling options to make an educated decision that works best for you. Be it an online market or exploring options through a local jeweller or dealer, be sure you are using the best option for your needs.

Diamond Fluorescence Testing Against Official Diamond Master Set

Example, if time is not of the essence, an online market or an auction house could be the best way forward. If you want a quick sale, visiting your local dealer may be the best option.

DCLA Diamond Laboratory provides an internationally recognised and respected report to any seller or prospective buyer.

DCLA will provide you with an experience expert to advise you and give you the accurate value protecting you when selling. Our goal is to provide you with as much knowledge as possible.

Questions about Laboratory or Synthetic Man Made Diamonds

Call the DCLA for information: