Lab Diamond ideal cut
Feb 16, 2023
What are the Essentials to Consider When Choosing a Diamond Cut?

A diamond cut can not only affect the way it looks but also the price. It is important to understand the basics to ensure you will be happy with your choice. We have put together a summary with the important factors you need to know when it comes to a diamond cut As you can see the article has been split in to two parts, Part 1: Round diamonds and Part 2: Other shapes.


Part 1: ROUND DIAMONDS. What Makes them Special?

The grade of the stone is specified in lab certificates only for round diamonds. For all round diamonds there is already an established global set of dimensions on which diamonds get assessed against. In the case of IGI certificates the highest is Ideal then Excellent, Very good, good and so on. 


What does the cut mean?

It is practically impossible to differentiate between an “ideal cut” and an “excellent cut”, or from an “excellent cut” to a “very good cut”. However if put side by side you might start noticing a slight difference in sparkle between an “ideal cut” and a “very good cut”. The cut is a good indicator on how well a diamond reflects light. The lower the cut grade the more tendency to have leakage in term of light. 
We recommend to our customers that it comes down to your own personal budget. As you might’ve notice there is a slight difference in price between cuts, however if you have to sacrifice one for the other, opting to get a bigger size stone its generally the winner as the size its clearly visible to the naked eye. 

An “excellent cut” stone is great if you are looking at saving some money while getting a great deal. And if you are on a tight budget but still want to get a good size stone, a good viable option would be a “very good cut”. 
For those who live in cities where we have showrooms, feel free to book an appointment and come and see for yourself the differences in cuts. 

lab diamond shapes

Part 2. ALL OTHER SHAPES. Why don’t they have Cut Grades?

There are no set of standard dimensions for all other shapes of diamonds. The main reason for this is because all the other shapes can vary on dimensions depending on personal taste. For example, when buying an oval diamond you will find some that are more elongated while others are more rounded. And that is across all shapes except rounds. Because of this, you will notice that the diamond certificates do not come with a “cut grading”. 

So how can you know if what you are buying is good?

Thankfully, our gemmologists developed a set of standards for each shape that are not round. Thanks to our grading system, you will find the “cut grade” of each stone when you search via our site. 
Unfortunately, we cannot analyse over 100,000 lab diamonds. Instead our gemmologist have analysed for you about 620 lab grown diamonds in UK and about 3,800 lab grown diamonds worldwide. If you happen to find a stone is not available in showroom or in the recommended section and would like to know about the cut, contact us and one of our gemmologist will be happy to assist you. To expand your knowledge our top gemmologist recommend you read our lab grown diamonds guide and lab diamond rings guide.


In summary

Choosing the right cut for your lab made diamond in UK affects its appearance and price. Round diamonds have established global dimensions and cut grades, from Ideal to Good. The cut grade indicates light reflection, with lower grades having more light leakage. For other shapes, there are no standard dimensions, but gemmologists have developed a grading system for each shape. To make informed decisions, consult a gemmologist or read lab created diamonds in UK guides to better understand cut variations and their impact on the diamond’s look and value.