When people talk about a Diamond’s symmetry they are talking about its shape and size. If has a good all around shape a size it is said to have proper symmetry. When this happens the value of the diamond goes up. If there is an improper symmetry however the diamond may be of a lesser value.
So, when someone talks about symmetry they are really talking about the over all shape and size of the diamond. Things like flaws and value come into play later in the grading process. You must keep in mind that all diamonds are valuable and all diamonds have a symmetry it is just to what degree.
It is important to keep in mind that diamonds become cut to different sizes later in the process of making them into things like rings, necklaces and bracelets. So, symmetry becomes important prior to the cutting process. This is true because the symmetry and other factors can help as a guide for how the diamond should be used and also the value of the stone.
Now that you know what is meant by diamond symmetry you have a better knowledge of the over all selection process. The grade of the diamond is determined later using a process which also uses the diamond’s symmetry to make sure that the highest quality of diamonds gets the highest value and grade.
There are many other factors that go into the grading process such as depth and width of the diamond and its polish. However, symmetry is where it all starts. To find the most amazing diamonds you need the proper symmetry.