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Choosing a well-cut diamond is extremely important and for some it is the most crucial of the 4Cs.

The cut determines the sparkle that the diamond gives off. It contributes to the fire (colourful flares), brightness (light reflecting off the top) and scintillation (flashes of light).
The GIA developed cut grades to evaluate colour and clarity but also the structure of a diamond. An Ideal cut diamond will have many more facets than a poorly cut diamond and will also have close to the ideal diamond proportions to maximise light performance. This is about finding the right relationship between the width of the top (surface table) and the depth of the diamond. A diamond that is too deep or too shallow will allow light to leak through rather than be reflected back out.
Diamond CutsDiamond Proportions


How to Compare

Cut grading only applies to round diamonds as these are simpler to measure in terms of light performance. The scale consists of Ideal/Excellent, Very Good, Good, Fair and Poor. Use our diamond comparison tool to get an idea for how price changes with cut grade.

Buy Like a Pro

  • We recommend choosing an Excellent or Very Good to avoid a diamond that loses light and does not maximise its sparkle, giving a dull glass-like appearance. However, if you are aiming to stick to a lower budget, a Good cut offers great value. This cut is in the top 25% in the world.
  • Always bear in mind the importance of cut when considering a trade-off between the other Cs as light performance is very critical.

More Advice
Feel free to get in touch for help with cut grade choice at info@hispek.co.uk