Orori Wedding Ring

Cut is probably the most important, and most challenging, of the four Cs to understand.
The brilliance of a diamond depends heavily on its cut.
Apart from the general shape of the diamond, "cut" refers to the reflective qualities of the diamond.
A good cut gives a diamond its brilliance, i.e. the brightness that seems
to come from the very heart of a diamond.

As shown in the images below, when a diamond is well-cut,
light enters through the table and travels to the pavilion where it reflects from one side
to the other before reflecting back out of the diamond through the table and to the observer's eye.
This light results in brilliance,
and it's this flashing,
fiery effect that makes diamonds so mesmerizing.

In a poorly cut diamond,
the light that enters through the table reaches the facets
and then 'leaks' out from the sides or bottom
of the diamond rather than reflecting back to the eye,
causing the stone to appear dark.
Less light reflected back to the eye means less brilliance.

Certain proportions have been found to radiate the maximum amount of brilliance.
The most important factors are how the depth compares to the diameter,
and how the diameter of the table compares to the diameter of the diamond.
Because cut is so important,
several grading methods have been developed to help consumers determine the cut of a particular diamond.
In general, these grades are: Ideal, Premium, Very Good, Good, Fair & Poor
Selecting the grade of cut is really a matter of preference.
To make the best selection, you need to understand the various grades.
Please note that the descriptions below are general guidelines.

Source : http://id.88db.com/id/Services/Post_Detail.page/Design/Jewelry_Design/?PostID=88408