– Distance in millimetres across the top of the diamond, as this will vary based on the diamond shape – see Diamond size chart below
– Diamond’s cut grade
This document illustrates how carat weight and shape will determine how a diamond looks when viewed from above. This document is for guide purposes only, your actual diamond may differ in terms of length / width ratio, table and depth.
The term carat weight, specifically refers to the weight of the diamond, however it is important not to confuse carat weight with size, as there are other aspects of a diamond that can affect how large it actually appears.
To gain a precise understanding of diamond size, Lover’s Rock recommends considering carat weight with two other key aspects:
It is important to measure the distance across the top of the diamond as this is how we view a stone when set into a ring. Likewise, your chosen diamond shape can have an effect, as for example elongated shapes (Marquise or Oval) tend to maximise carat weight, making them appear larger than rounded stones of the same weight.
A diamond’s cut grade should also be considered because, as we noted in the cut grade section, when a diamond is cut with the proper proportions, the maximum amount of light (brilliance or sparkle) reflects back out of the top of the diamond. When a diamond is well cut, the light reflected out of the top makes it appear larger. In a poorly cut diamond, light entering the diamond ‘leaks’ out from the bottom (if cut too shallow) or sides (if cut too deep), producing poorer light reflection and therefore less brilliance or sparkle, making the diamond appear smaller than its carat weight would imply.
It is therefore possible to have a diamond of a lower carat weight, but higher cut grade, which appears larger than a diamond with a larger carat weight, but poor cut.
To choose the best carat weight of diamond, consider the size of her finger, the size of your ring setting, and your budget.
Now that you understand carat weight, learn about a diamond’s cut.
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