Round Cut Diamonds

Round diamonds are traditionally the first and most popular diamond that’s given as a symbol of commitment. They have a classic uniform and symmetrical shape. Round diamonds have 58 facets, that qualify them a brilliant cut. Their faceting also makes color and inclusions appear better than other fancy shapes. Over 50% of all diamonds purchased are round cut diamonds. They are overwhelming a popular selection for engagement rings and bridal jewelry.


Round Cut Pricing

Round cut diamonds carry the largest premium from two reasons: demand and rough wastage. Round diamonds are the most popular and so manufacturers and suppliers tend to hold a premium because their demand can make them rarer. Because diamonds are a natural material, they cannot just be produced on a moment’s notice. Second, a rough diamond is mined, it comes in a variety of shapes and sizes. There is no predictability around what size or shape will be unearthed. More often than not, the shape of the rough isn’t perfect for cutting a round diamond. A diamond cutter’s top priority is to maximize carat weight. Round diamonds yield the highest rough wastage and top out between 28% - 38% rough usage. Finally, round cut diamonds have less depth than many other fancy shaped diamonds. This means the carat weight is pushed out further to the sides and results in visually larger looking diamonds. A 1.00 ct round cut diamond is approximately 6.4 mm, whereas a 1.00 ct princess cut diamond is about 5.5 mm. That’s almost a 16% visual difference.


Round Diamond Guide

Below are the approximate diamond characteristics for round diamonds and their cut grading scales. A round diamond will typically be between 1.00 and 1.03 ratio. Above 1.05 length to width ratio, the diamond will be out of round. View our comprehensive round diamond size and millimeter chart.

The beauty of the round cut diamond lies in the mathematical precision of the cuts, maximizing light and brilliance through the 58 facets. This makes the round cut the most expensive diamond cut. This is due to the fact that during the process, a lot of the stone is cut away to reveal one exquisite perfect round brilliant stone. When you shop, for the best diamond remember the four C’s of diamond buying, color, clarity, carat and cut. Choose a round stone with the highest cut grades, that is ideal or very good. For symmetry and polish, grades ideal, excellent and very good are best. Then it is left up to your own budget and personal preference as to which style or setting you prefer or that your bride will love.

Depth % for Round Diamonds

side view of round diamond showing its depth measurements

Excellent: 67%-57%

Very Good: 68%-53%

Good: 72%-49%

Table % of Round Diamonds

top view of round diamond showing the table facet

Excellent: 65%-53%

Very Good: 69%-51%

Good: 74%-47%

Length to width Ratio for Round Diamonds

length to width ratio of ideal or excellent cut diamond

1.00


Round Color and Clarity Guide

Depending on the size of your round cut diamond, there are varying color and clarity grades that will have implications on diamond sparkle. We’ve made a chart to quality these ranges.

Scale of diamond sizes from 0.25ct to 5.00 carat weight
Scale of diamond sizes from 0.25ct to 5.00 carat weight Scale of diamond sizes from 0.25ct to 5.00 carat weight Scale of diamond sizes from 0.25ct to 5.00 carat weight
round diamond with ideal color

Color Grades For Round Diamonds

> 0.50 ct
  • Ideal: D-H
  • Great: I-K
  • Good: L
0.50-1.00ct
  • Ideal: D-G
  • Great: H-J
  • Good: K-L
1.00ct-2.00ct
  • Ideal: D-F
  • Great: G-I
  • Good: J-L
< 2.00ct
  • Ideal: D-F
  • Great: G-H
  • Good: I-L
diamond with perfect clarity

Clarity Grades For Round Diamonds

> 0.50 ct
  • Ideal: FL- VVS1
  • Great: I-K
  • Good: L
0.50-1.00ct
  • Ideal: D-G
  • Great: H-J
  • Good: K-L
1.00ct-2.00ct
  • Ideal: D-F
  • Great: G-I
  • Good: J-L
< 2.00ct
  • Ideal: D-F
  • Great: G-H
  • Good: I-L

Round Diamond History & Origins

Technological advances have improved the process of cutting diamonds and today we can enjoy the 58 facet round diamond cut. Its circular shape showcases 58 different eye catching facets of the diamond. It maximizes and catches the light from all angles which is why it is popularly referred to as round brilliant diamond. The round cut is the most popular shape of all the well known cuts in gemstones. It is easily identified and lends itself to every occasion night or day and every wearer, young or old, contemporary or traditional.

The search for the cut to showcase the facets of the diamond gemstone’s radiance and brilliance has led the way to many new cuts throughout the years. For many years the technology or the machinery simply did not exist for the round cut diamond. The invention of the bruting machine towards the end of the 1800s, made possible the round cut. Before the circular cut was invented diamonds sported a cushion cut popular in Europe. In 1919 the circular cut went through another transformation with Marcel Tolkowsky’s Diamond Design Thesis.


Popular settings for the round cut include

Engagement rings: Timeless elegance can be paired with traditional or contemporary styling for the perfect engagement ring

Diamond necklace: A solitaire diamond necklace will stand the test of time and add radiance and sparkle to any decollete

Round cut solitaire earrings: These are a popular gift choice because they complement any outfit and all personalities