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When it comes to diamonds, most people tend to use the words “cut” and “shape” interchangeably. But for diamond professionals, there is a big difference. Diamond Shape refers to the outline of the stone (pear, oval, round, etc.). Diamond cut refers to a stone’s facet arrangement (the way it is cut).
The most common diamond shapes include Round, Oval, Heart, Marquise, Princess, Emerald, Pear, Radiant, Cushion and Baguette.
Find our more about the different shapes available to purchase through Diamonds of Choice here
A diamond's size is measured in carats - the amount it weighs. Each carat is 200 milligrams and can be subdivided into 100 'points', allowing very precise measurements to the 100th decimal place. Find out more. (Size may differ depending on your screen resolution) >
Colour grades are based on the absence of colour - a D colour diamond is colourless, therefore has a higher value. Find out more
The GIA Clarity Scale measures the absence of inclusions and blemishes. It has 11 clarity grades, ranging from Flawless to I3. Find out more
Pricing a diamond requires the assessment of every stone's individual qualities in order to come to an accurate valuation. This includes the valuer considering the diamond's cut, clarity, colour and carat - The 4Cs - as well as the additional qualities of polish, symmetry and fluorescence.
It is only by assessing all of these qualities that a diamond price will be determined and this is why larger diamonds aren't necessarily more valuable than smaller stones.
If you would like more information on how diamonds are valued, or have a query about a certain stone's price, please contact us.
A diamond's cut grade assesses how well its facets interact with light. To grade the round brilliant cut, GIA calculates the proportions of the facets that influence the diamond's face-up appearance. Find out more.
Diamonds are the hardest known material and has different degrees of hardness in different directions - which makes it difficult to cut. As the rough is being cut to create the finished diamond, the machinery leaves polishing lines in the process. These polish lines are then removed by a craftsman by polishing the diamond on the wheel.
Although the goal is to remove polish lines, it is vital to be careful to not to over polish the stone as the surface can easily get burnt and leave a 'lizard skin' pattern on the surface which makes the stone un-usable.
Grading a diamond's polish requires the diamond grader to look for any polish marks or lines and assess the impact on the stone's sharpness and sparkle. Find out more.
Symmetry refers to the alignment of a diamond's facets. In a perfect arrangement the bottom facets align with the top ones, and the facets on the right side are mirror images of the facets of the left side depending on the shape of the diamond. Find out more
25–35% of diamonds emit a visible coloured light when exposed to UV rays, this is referred to as fluorescence. The most common colour emitted is blue, which can actually make a light yellow diamond look closer to colourless in sunlight, although other colours can sometimes occur including yellow or green.
For many people, the presence of fluorescence doesn't affect the colour of a diamond as much as other factors do, including the cut, so the preference to buy a diamond with fluorescence is a purely personal one.
Each GIA report will measure the strength of the fluorescence on a scale from Very Strong to None. Find out more.
Although GIA do not give a Lustre grading on their certificates, we have added this quality as we feel it is an additional way for you to understand the brilliance of a diamond.
Lustre refers to the way light interacts with the surface of a diamond.
At Diamonds of Choice we only supply diamonds with an Excellent or Very Good Lustre, which means all our diamonds show a high to very high level of fire and brilliance when interacting with light.
We offer a select range of matched diamonds, suitable for earrings or side stones on a mulit-stone ring, however if you do not find what you are looking for, please contact us with your specific requirements.