Diamond Seminars, educate

Introduction to Diamond Buying for Consumers

Buying a diamond does not need to be a confusing process – DCLA offers in-laboratory seminars to teach you what you need to know about diamonds and how buy the smart way, and get the right diamond at the right price.

DCLA diamond experts will walk participants through ‘How to Buy a Diamond’ during a 2-3 hour in-house workshop located at the actual DCLA Laboratory, topics including:

  • Detailed explanation and hands-on evaluation of the 4C’s of diamond grading. Participants will take part in the grading process to learn how the quality and value of a diamond are established.
  • Discussion of how the diamond shape, size, and quality affect its value
  • How to go about buying or selling a diamond, the options available and which option is most appropriate for you to get the best value
  • How to read, understand, and compare Diamond Grading Certificates
  • Explanation and identification of diamond treatments and synthetic diamonds, and how they affect value

Participants will have ample opportunity to ask questions throughout the workshop. Workshops are conducted 2-3 times per year, please note that spacing is limited.
Contact DCLA on 1300 413 425 to register and reserve your place.

You may redeem the cost of the workshop against any later purchase or sale through the DCLA Diamond Exchange

Diamond buyers guide

The word diamond comes from the Greek term adamas, meaning unconquerable. Every diamond is unique. Diamonds symbolize love. A beautiful stone will be treasured forever. A beautiful stone represents forever. To be handed down from generation to generation. So you want to be sure you are getting the right one. It pays to do some research before buying, exploring your options. Diamonds are hundreds of millions of years old, so take a little time finding yours.

The 4C’S


The quality and value of a diamond is judged on four fundamental criteria known as the four C’s. The carat-weight, colour, clarity and cut. By understanding these qualities you can determine which traits are most important to you, and find a balance between them that best suits your needs.

There are no cheap diamonds. There are expensive diamonds and inexpensive ones, depending on shape, size and quality. Set your budget, and then decide on the characteristics you want. Whatever your budget may be, the aim is to get your moneys worth.


The weight of a diamond is expressed in carats. The word carat comes from the carob tree whose seed was used as the standard of weighing precious stones. 1 carat equals 0.2 grams. A carat is further subdivided into 100 points. 0.50 ct = 1/2 carat = 50 points. Weight is the most obvious factor in determining the value of a diamond. But two diamonds of equal weight may have very unequal values, depending on their quality. Furthermore weight only indicates size. Depending on proportions two diamonds weighing the same may appear very different in size. Internationally, the weight of a diamond is mentioned to two decimal places.

Deciding on carat size is really about striking a balance between size and quality.


Most diamonds have inclusions or imperfections. The number, size, position, contrast and visibility of these inclusions determine the clarity grading. Clarity is graded under overhead lighting with 10-x magnification. Grades correspond to the International Clarity Grading Scale. (See insert) Inclusions falling into grades of SI and better are generally not eye visible. Depending on your preference you may choose a diamond of lower clarity and better colour or larger size, or vice versa.


Most gem quality diamonds fall within the Cape series, a range of colour from colourless to yellow. D or colourless diamonds are rare. The colour of a diamond is determined on the basis of a visual assessment by comparing it to a set of master diamonds under laboratory conditions. The differences between colours are very subtle and graded according to the International Colour Grading Scale.

Diamonds exist in many colours, such as blue, pink, purple, yellow or red. With the exception of these natural fancy colours, the colourless grade “D” is the most valuable. Colours D to J are best for setting in white gold or platinum. Yellow gold settings are better for lower colours. Diamonds with a slight brown or grey body colour will be given an Equivalent Colour Grading (ECG).

Fluorescence is a natural characteristic of diamonds, occurring from sub microscopic structures within the diamond. Diamonds can have various colours of fluorescence, with blue being the most common. Many consider fluorescence an undesirable characteristic. However, in some cases, fluorescence can improve appearance rather than detract from it, by making the diamond appear whiter. Fluorescence grades are: nil, slight, medium and strong.


Cut refers to the shape, which is determined by an individuals taste. There are many different shapes available so take time to look around and see what shape is your preference. The Round Brilliant is the most traditional shape, however the Square Princess, Square emerald or Asscher cut, as well as other fancy cut diamonds have become very popular.

More importantly cut refers to the proportions, symmetry, and finish or make of the diamond. The cut of a Diamond is the only property, which is totally dependent on man. Each stone loses, on average, more than half its original weight during cutting and polishing. Proportions and angles influence the internal reflection of light as well as the dispersion of light leaving the diamond. This determines the brilliance and fire (brightness and sparkle) of the diamond, and ultimately its beauty. How well cut a diamond is will reflect in the price.

Is There An Ideal Cut?

When it comes to Round Brilliant diamonds you will encounter many marketing terms. Russian Cut, Hearts and Arrows, Ideal Cut to name but a few. No, there is no one optimum cut. There are several so called Ideal cuts all with slightly different proportions. These are all variations of the original Tolkowsky Ideal, depending on the taste of the relevant market. For example the European market prefers a slightly larger table to the American market. Ultimately taste and preference for the overall appearance will determine the buyer’s choice. There is no doubt that working within definite parameters yields a better stone but in the end your eye should make the final decision. So look around, compare diamonds and see what you fancy.



All the above does not mean much if you don’t have the Fifth and final C

Certified (adj) endorsed authoritatively as having met certain requirements; holding appropriate documentation and officially on record as qualified to perform a specified function or practice a specified skill.

Accurate assessment of a diamond is only possible prior to being set. Once the stone is set even a qualified diamond grader cannot precisely determine colour, size and purity. The Diamond Certificate is only reliability if it is from an independent and qualified laboratory. Besides the international standards to which these laboratories grade, qualified laboratories have the necessary equipment to check for Synthetics, Simulants and treatments. Synthetic and treated diamonds have a significantly lower value, and this information should be disclosed. So always insist on a diamond grading certificate from an independent and recognized diamond grading laboratory.

Most reputable retailers sell independently certified diamonds. Why independent? This assures an unbiased and objective assessment of the diamond. A conflict of interest exists if the person selling the diamond also determines the grade.

Shopping for independently certified diamonds allows you to make an informed choice about your selections, and to comparison shop.

Be aware a valuation is not a diamond grading report. The quality of any diamond assessed after having been set can only be estimated. A diamond grading report should include a plotted diagram of your diamond and all significant characteristics, including cut, colour, clarity, and carat weight. The report will also describe the diamond’s shape, exact measurements, proportions and percentages as well as grade the overall proportions, symmetry and polish. It should also comment on the characteristics like fluorescence, graining, and any material characteristics of the diamond.

The increased prevalence of treated diamonds, synthetic diamonds and diamond simulants makes certification vitally important to ensure you have a natural untreated diamond.

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.

Consumers are becoming more discerning and better informed; the internet is full of information and misinformation that can confuse the diamond buying customer, and jewellers now more than ever need to have the right answers for the barrage of questions they face when potential customers walk through the door.


With these factors in mind, subject areas covered in the workshop include the following:

  • Detailed explanation and hands-on evaluation of the 4C’s of diamond grading. Participants will take part in the grading process to learn how the quality and value of a diamond are established.
  • Guiding consumers to the shape, size, and quality right for them.
  • Proper handling and presentation of loose diamonds for customer viewing.
  • Explanation and identification of synthetic and treated diamonds, and how value is affected.
  • How to read and explain Diamond Grading Certificates

Discussions regarding common consumer misconceptions and answering frequently asked questions with confidence, topics including:

  • Differences between diamond grading certificates
  • The influx of online retailers and managing price comparisons
  • Conflict diamonds and the Kimberley Process

Participants will have ample opportunity to ask questions throughout the approximate 6 hour workshop.

Custom-tailored Trade Courses

As a jeweller, you play an extremely important role in empowering consumers with the knowledge they need to make a successful purchase.

DCLA custom-tailored seminars will assist you in guiding your staff in pointing customers to the right diamond choices.

Please contact DCLA  to inquire about a custom-tailored course you need for your staff. +612 92612104 or email [email protected]