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Diamond Buying Guide

Diamond Cut

Brilliant round diamonds are the only diamonds to have a measurable cut grade. This is because gemmological grading institutes unfortunately cannot agree on what is considered a perfect cut on princess cut, oval cut, or other diamond cuts. Diamond cutting is an exceptional skill and takes a lot of intense training. A cutter polishes tiny surfaces known as facets onto the rough diamond. These facets are known as the table, culet, crown, girdle, and pavilion of the diamond.

When the diamond facets are arranged in accurate proportions, the diamond refracts the light straight back to the eye creating a brilliant sparkle. To create a finished diamond sometimes the diamond cutter will remove more than 50% of the rough diamond.

When a diamond is poorly cut, the light is refracted differently meaning that less light is reflected to the eye resulting in the diamond ‘losing its sparkle’.

There is a set of formula that is used by gemmologists to determine the cut grade of a diamond and this inevitably comes down to how the diamond refracts light based on the diamond cut and symmetry, these grades are:

  • Excellent – Reflects all or nearly all the light that enters the diamond. A
  • Very Good – Reflects nearly as much light as the excellent cut, but for a slightly lower price.
  • Good – Reflects quite a lot of light that enters the diamond. A little less expensive than a very good cut.
  • Fair – Reflects some of the light that enters the diamond, but much less than excellent cut.
  • Poor – These diamonds are normally so deep and narrow or so shallow and wide that they lose most of the light from the sides and bottom, losing its sparkle.

What cut should I choose?

At Wedstones, we recommend and therefore only focus on excellent or very good cut diamonds as we feel that you get a lot more for your money with excellent or very good cut diamonds, if we cannot source what you’re looking for we will do our best to upgrade your diamond where we can. The diamond cut grade is also based on the durability of the diamond which is another reason we feel a higher cut grade is so important. If you have specific requirements, please feel free to contact us prior to placing your order and one of our experts will be happy to assist you. Once we have sourced your diamond, by request we can send you the details or grading report of the diamond but be assured we are very selective when sourcing diamonds and find you the best we can is our priority!

If you’d like to find out more about cut grades, please watch this informative video…

Need some help?

If you would like something specific that we don’t offer online please contact us on 01386 641953 or email and one of our experts will be happy to assist you.

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