Which diamond cut looks the biggest? Have you ever wondered if a 1 carat round brilliant cut diamond looks bigger than a 1 carat princess cut diamond? I am often asked whether round or square diamonds look bigger by many brides-to-be as they begin the journey of picking their perfect diamond engagement ring. While the sparkle and fire of a diamond are important, the physical size of the diamond can also play a part in your decision making process.
Here is the maths for the surface area of a 1 carat princess cut diamond versus a 1 carat round brilliant cut diamond.
Formula for the surface of a square is length x width. square = a2 
For a perfect cut 1ct princess cut it would be – 5.5 x 5.5 = 30.25
Formula for the surface area of a circle = pi r 2 
For a perfect cut 1 carat round brilliant cut diamond with a 6.5mm spread – 3.252 x 3.14 = 33.16
From this basic analysis of the two different stones we can see that the round brilliant cut diamond is approximately 10% larger in surface area than the princess cut diamond. While this doesn’t take into account the effect of the claws, on face value it appears the round brilliant cut is winning the size debate. However, if you took the diagonal measurement of a 1 carat princess cut, it would measure approximately 7.7mm, which is more than 1mm wider than a 1 carat round brilliant cut diamond. So sometimes, when determining which one is bigger, it simply depends on how it appears in the flesh.
If you are about to set out on the hunt for your engagement ring and want to know how to get the biggest diamond for your buck, then read on. Ultimately, if you were to spend the same money, the princess cut diamond would actually give you a bigger physical diamond in comparison to the round cut diamond. This is because the rough crystal for a princess cut diamond is significantly cheaper and more economical to cut than that of the round.
Therefore, should size be an important consideration for you, you will be able to get a bigger diamond overall for your budget. On average, for well cut diamonds, there is at least a 25% price difference between a round brilliant and princess cut diamond. In the case of a 1 carat F SI1 round brilliant cut diamond, you would be able to buy a 1.3 carat F SI1 princess cut diamond.
From this we can see that if you were to spend the same budget, you would actually get a 10% bigger surface area by purchasing a princess cut diamond ring, instead of a round brilliant cut diamond ring.
While maths can be fun (well for some of us anyway), we are really passionate about finding the perfect diamond for you. Whether you have your heart set on a round brilliant cut diamond or a princess cut diamond, we will find the perfect ring for you. We are always available for a chat, and have an amazing selection of loose diamonds for you to have a look at. Please feel free to email me, if you have any questions or would like to make an appointment to view our diamonds.
