The 4C’s

Diamond Carat Weight

The Carat weight of a diamond refers to only the weight of the diamond but is often confused with the actual physical size and look of the diamond. Carat weight is not a measurement in size ie; millimeter sizing, but only a weight measurement the same as a Kilogram or gram weight. Unlike gold, where carat refers to purity of metal, in diamonds as well as in most precious stones, carat refers to the weight only which means the spread of a stone can vary.

The word “carat” has come about by past methods of weighing diamonds. One carat was equal to one seed from a carob tree. This has since been standardized and one carat is equal to 0.2 grams. One carat is divided into 100 ‘Points’ so that a diamond of 50 points (.50ct) is described as half a carat.

We are more than happy to further explain the difference and details of Diamond Carat Weight, Diamond Colour, Diamond Clarity and Diamond Cut, all characteristic that determine the value and luster of a diamond.

Be sure to Contact Us for further information.

Diamond Colour

Although diamonds cover a wide selection of colours including pink, champagne, blue, green and intense yellow, most commonly they range from a faint yellow or brownish tint to the extremely valuable colorless diamonds, D grade. A colorless diamond is graded ‘D’ and is fairly rare. MDTdesign carry ‘D’ colour through to ‘G’ colour diamonds and these stones are considered ‘very fine white’.

GIA (Gemological Institute of America) Colour Grading scale


Fancy colored diamonds, such as yellow diamonds, pink diamonds, or champagne diamonds, are graded on a different colour scale. The more intense the colour of the diamond, the more rare, valuable and usually more desirable a stone is.

If you would like something really unusual, MDT Design also have one of the largest ranges of coloured stones including pink diamonds, yellow diamonds and champagne diamonds Australia has to offer.

We will be more than happy to explain the importance of Diamond Colour as well as Diamond Clarity, Diamond Cut, and Diamond Carat Weight, all characteristics which determine the value and beauty of a diamond.

Contact Us to make a further enquiry.

Diamond Cut

A diamonds Cut should not be confused with the shape of a diamond. Diamonds do come in a variety of shapes, but only round brilliant cut diamonds can have a cut grade. Fancy cut diamonds, such as Princess cut, marquise cut, oval cut, emeraldcut, and pear shaped diamonds, do not have a cut grade as every stone can have completely different proportions in terms of length, width and depth. These stones need to be inspected and compared with others in order to find the brightest stone that reflects the most light. Most fancy shaped diamonds do have polish and symmetry grades, though this gives no indication of the cut or the brightness of the diamond. Even fancy cut diamonds that have excellent polish and symmetry grades are not guaranteed to be bright stones.

A diamond cutter’s skill lies in releasing the maximum amount of sparkle and lustre from a piece of uncut rough diamond.
Whilst all of the 4C’s are highly important, it is the ‘cut’ that influences the brightness and sparkle of a diamond most dramatically. A well-proportioned diamond will reflect light from facet to facet and return that light back through the top of the diamond known as the “table”.
If the cut of a stone is too deep or too shallow light will be lost through the side, resulting in a dull diamond.

MDTdesign mostly use ‘Excellent’ cut graded diamonds.


We will be happy to further explain to you the importance of Diamond Cut, Diamond Colour, Diamond Clarity, Diamond Carat Weight and Diamond Shape, the characteristics that determine the value and beauty of a diamond.

Contact Us to make any further enquiry.

Diamond Clarity

Diamond clarity refers to the grading of the inclusions that are naturally formed in the diamond. These occur in a diamond as it is being formed deep in the ground. Almost all diamonds contain small traces of non-crystallized carbon known as inclusions. The Clarity grading is used to indicate the extent of which a diamond is free of inclusions. Preferably, the inclusions should not affect the brilliance or brightness of the diamond, nor effect any reflection of light through the diamond which will lower the luster of the diamond. The definition of the clarity grading on diamonds is that the inclusions should not be visible to the naked eye down to an SI2 grade and not effection the look of the stone to the naked eye.

Due to what we believe to be a slight diamond grading shift over the years, many stones up to VS2 grading do have visible inclusions to the naked eye. MDTdesign carefully inspects every diamond that we purchasing or consider selling to our client’s and if we find that the diamond does have inclusions visible to the naked eye, we will not sell or stock that diamond. This is why it is extremely important to carefully eye view every diamond you are considering purchasing. There is a big difference between a good SI2 graded diamond and a bad SI2 graded diamond as there is with all the other grading’s. Along with this comes a price difference as well. We only sell the top end of all clarity’s and in store we can show you the differences and what is true to its definition. We would much rather our clients have a high end graded SI2 diamond rather than a bad quality SI1 clarity diamond that is not true to the Certificate. Certificates can be wrong or lenient and you should not buy a stone purely based on its certification.

MDTdesign carry mainly ‘VS’ (Very Slight Inclusions) and ‘SI’ (Slight Inclusions) clarity diamonds but, as with colour, we are happy to work to your specifications if you would prefer a higher clarity graded diamond.
GIA Clarity Grading


Recently many Diamonds termed ‘clarity enhanced diamonds’ have been found being sold around Australia. These stones are of poor quality have either been laser drilled to remove large black inclusions or have had fractures in the stone ‘filled’. MDTdesign do not sell this quality of diamonds nor would we recommend buying one.

We will be happy to further explain the importance of Diamond Clarity, Diamond Colour, Diamond Cut and Diamond Carat Weight, all characteristics that determine the value and beauty of a diamond.

Contact Us further if you would like any further information.

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