Diamond Carat

Understanding diamond carat weight, measurement and value

If you’ve ever wondered what a diamond carat is and how it is measured, allow us to explain. Simply put, a carat is a standardised measurement of the weight of a precious stone, with one carat equal to 200 metric milligrams. One carat diamonds are considered to be very large and exceedingly rare, especially in the world of Argyle pink diamonds.

One carat is further broken down into 100 points, allowing jewellers to very precisely describe the weight of any given stone. Stones can range from smaller jewellery garnishing sizes of 0.01ct to 0.07ct in size, with more substantial premium investment stones weighing 0.20ct or above. 

A higher carat diamond isn’t automatically a more expensive one

In the world of diamonds, it’s somewhat true that size does matter. An enormous 5-carat diamond will always have a significant value because large stones are rarer than smaller ones. However, because of the higher initial value of such a stone, finding buyers and securing a significant return on your investment can be hard.

Carat isn’t the only metric for determining a diamond’s value, either. Each unique aspect of the diamond is scrutinised to find its true value, with diamond experts assessing based on The 4 Cs of diamonds: carat, colour, cut and clarity. Round, modified fancy and square-shaped diamonds all offer a particular value, and some cuts can make for a dazzling diamond that appears larger, despite technically having a lower carat count than another. A diamond’s clarity refers to any flaws or blemishes on either the surface or within the stone. Finally, the Argyle colour grading system is used to classify a coloured diamond’s hue, its overall colour saturation, and whether any overriding tint is present.

A combination of all of these factors and the rarity of a diamond is what forms its overall value. For Argyle pink diamonds, a combination of their unique colour, a desirable size, substantial carat and overall rarity is what will ultimately determine how much they are worth.

Choosing the right Argyle pink diamond for a profitable investment

While diamond carat charts can give some indication of the expected size a certain carat diamond will have, the cut also plays a huge role in how large the stone will be, its desirability and value. In order to choose a diamond that will hold its value and steadily deliver an increased return on your investment, you need expert advice to weigh up The 4 Cs of diamonds and how they affect the stone’s assessment as a whole. At Argyle Diamond Investments, our team is trained and has years of experience in doing just that.

How Argyle Diamond Investments can help you manage your pink diamond investment

When it comes to entering the diamond market and diversifying your investment portfolio, Argyle Diamond Investments can offer you all the expert advice required to make your decision. Our clients choose us for our sound investment advice, intimate knowledge of the Australian pink diamond market, and friendly and personable style. If you’re ready to start investing in one of the world’s rarest and most beautiful natural gems, chat to us today to organise a VIP pink diamond viewing.


Referring to the weight, rather than the size of a stone, a carat is a unit of measurement equal to 200 milligrams. Each diamond carat unit can be further subdivided into 100 points and expressed as decimal points — for example, a 0.18-carat diamond.

Depending on the cut of the stone, a one-carat diamond may appear to be bigger or smaller than another stone of different weight. In general, though, a round cut one-carat diamond will be around 6.5mm in diameter, with a crown of around 33.2mm².

The origin of the carat system dates back to the ancient world when a carob seed was used to compare the weights of different precious stones. Today, the carat system of measurement is standardised across the world, with one carat being 200 metric milligrams.

While you might think a higher carat count automatically equals a more valuable stone, this is not necessarily the case. Because a diamond’s carat is based on weight and not size, two stones with very similar profiles may vary in carats substantially, based on the depth of the cuts to achieve the stone’s aspect. In assessing a diamond’s quality and value, jewellers and expert investors look to The 4 Cs of diamonds – being carat, colour, clarity and cut. When it comes to Argyle pink diamonds, a pure pink, purplish-pink or pink rose colour is also an important factor in determining their value and return on investment. Overall, regardless of what hue or variation you select, it’s the depth and intensity that makes the diamond worthy of investment.


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