There is a difference between Carat and Size, although people often confuse them. In diamonds, size refers to the measurement in millimetres, while carat refers to its weight in grams.

Have trouble understanding the carat unit? Here’s an example. Let’s say we have two diamonds that are each 1 carat. If the first one is cut very deep, it will look closer to a 0.80ct stone than an average 1ct one. Alternatively, if the second one is cut very shallow, its size may look closer to a 1.25ct gemstone, but its quality may suffer. In other words, in order for 1ct diamonds to look good, they also need to weigh 1ct.

Whenever diamonds are cut too deeply or too shallow, the quality is always compromised, resulting in the diamond not achieving its full brilliance and sometimes looking dark or lifeless throughout.

Among the 4Cs, colour is the easiest to understand. A diamond’s colour grade indicates how colourless it is. Diamonds with no colour shine brightest, allowing their brilliance to shine through. Stones that are whiter, or, to put it more precisely, clearer, are more valuable. As the colour grade decreases, hues of other colours, such as yellow and brown, become more noticeable, lowering the diamond’s value. In GIA’s system, diamonds are graded from D (colourless) through Z (light yellow or brown). As diamonds with a 1 or 2 colour grade difference may appear similar to the untrained eye, grade differences are typically separated by distinct tiers.

D,E,F (colourless)
How are D-F grade diamonds classified? They consist of the highest color grade and are also the rarest. Because D and F diamonds are colourless, they are extremely clear and bright, and they do not contain any yellow or brown tint whatsoever. D and F are categorized as colourless because when placed in a setting, both stones appear the same. In order to distinguish a D diamond from an F diamond, both stones must be loose and placed on a white background.

G,H (near colourless)
How do diamonds of G-H grade differ from diamonds of higher grades? The grades G-H are considered close to colourless and are almost as good as D and F. Even though they have a very slight tint of colour, they are not readily visible to the naked eye. If placed in a setting, they will appear white and still look colourless. The very slight tint in the stones will, however, only be visible when they are loose and compared to colourless diamonds.

I,J (very faint Colour)
Which diamonds are graded I-J? In comparison with the earlier two tiers, these stones are more common and of lower quality, having a very faint colour. Compared to diamonds in the colourless or nearly colourless categories, I-J diamonds have a more noticeable yellow, brown, or grey tint. If the diamond’s colour is lower than a J, it will have a distinctly yellow, brown, or grey tint.

A recommendation from Novita: Due to their clarity and colourlessness, D-F colour diamonds appear very similar to each other to the untrained eye; therefore, there is no compelling reason to choose a D over an E or F, outside of personal preference. When the diamond’s colour is at least F or higher, more of the budget can be allocated to getting a bigger diamond, which is more important, or a better cut.

Even though G-H colour diamonds are relatively affordable and plentiful, they are also near colourless, making them a good affordable choice and the best ‘budget’ option. Due to the considerable savings from purchasing G-H diamonds, a much larger stone is possible than it would have been with a D-F diamond.
Recommended by Novita: You can save money or get a larger stone by going for diamonds D-G in Colour.

The Cut grade is the last and most important of the 4C’s. There can be no doubt that the Cut of a diamond is of utmost importance, as it has the greatest influence on its appearance. There is a direct relationship between the Cut of diamonds and the sparkle, fire, and brilliance they exhibit. In the case of an incorrectly proportioned diamond, i.e. one that is cut too deep or too shallow, the light will leak out of the bottom of the stone. It is important for light entering a diamond to bounce back up and not leak out the bottom or sides, which would render it dull and lifeless. Diamonds that are cut properly are brilliant in appearance. The light that enters a well-cut diamond reflects off all the sides, or the diamonds’ facets, and comes straight back up, imparting in the diamond a scintillating and otherworldly appearance. In fact, the Cut is so critical to a diamond’s appearance that even a diamond of exceptional quality can seem dull and lifeless if its grade is not high enough.

Recommended by Novita: Select only diamonds with Ideal Cut or Excellent Cut.

If you or someone you love is looking for a lab grown diamond, we highly recommend you come into our showroom to get further guidance. Our expert gemmologists have hand-picked the showroom options in order to ensure that only the highest quality diamonds are available for you to view at your appointment and to purchase online. After our gemmologists sort through hundreds of diamonds, we only select the best diamonds in every colour and clarity category.

As shown in the image below, you can filter diamonds by their 4Cs category on our Novita website.

Select ‘AVAILABLE IN SHOWROOM’ in the tab menu and check ‘SHOWROOM’ in the column to further filter our available diamonds.