Ideal Round Diamond Proportions

So using the above numbers to derive a rule of thumb benchmark we can conclude that an ideal cut diamond should have a top that has a width of 53 to 57 5 of the girdle a pavilion that is around 43 1 43 2 and a crown that is around 14 4 16 2 of the girdle diameter. When you set out to buy a diamond be it for an engagement ring an anniversary necklace or a pair of earrings to celebrate a graduation there s quite a bit more to consider than just how shiny it is. As demonstrated on the table at the top researchers have found that a pavilion angle within the range of 40 6 and 41 0 gives a diamond the most amount of brilliance.

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The ideal crown height is between 14 16 and the ideal pavilion depth is between 42 5 43 5.

Ideal round diamond proportions.

For a princess cut diamond choose a diamond with an ideal depth of 68 to 75 percent. Shape depth table girdle culet l to w ratio. 1 0 1 08 sq 1 15 1 25 rect. Ideal depth and table for round cut diamonds.

Thin slightly thick 1 5 4 none. However it has now been scientifically proven that an ideal cut could have proportions outside of this value and diamonds with slightly bigger tables can also achieve ideal optical properties. 61 68 68. Eventually diamond cutters in america adapted their production of round brilliant cut diamonds based upon the findings of diamond cutters like henry morse and marcel tolkowksy and produced what became known as the american ideal cut diamond which is cut to the following range of proportions.

So for a diamond with a thin to medium girdle 2 5 3 a simple calculation results in a range of total depth to be. Here s a beautiful 1 10 carat princess cut with a depth of 73 3. The pavilion angle the angle of the bottom part of your diamond and the crown angle the angle of the top work together to return light as sparkle. Thin slightly thick 2 3 5 none.

Super ideal round cut. For a round diamond an ideal depth percentage is between 59 and 62 6 percent this very nice 1 30 carat round cut for example has a depth of 61 8. The tolkowsky ideal is a 34 5 degree crown and a 40 8 degree pavilion but you don t need these exactly. Min crown max pavilion min girdle min total depth 14 43 5 2 5 60.

Within a certain degree however a slightly too shallow or slightly too steep pavilion angle can be counterbalanced by an appropriate crown angle. For a cushion cut diamond look for an ideal depth that s between 61 and 68 percent. Symmetry vg to excellent for ideal and excellent for super ideal. Best diamond proportions for every diamond shape.

In tolkowsky s initial publication he stated that the ideal cut diamond should only have a table proportion of 53. Polish vg to excellent for ideal and excellent for super ideal.