Diamond Symmetry explained
On the diamond certificate is listed a characteristic called diamond symmetry. Symmetry refers to how well the facets and angles of the diamond align. Since the sparkle and beauty of a diamond is determined by how well light reflects through it, a diamond with “better” symmetry will (in theory) have more sparkly then one with a poor symmetry.
What Diamond Symmetry to look for
In general I recommend buying a diamond with a symmetry rating of “Good” or better. All other things being equal I wouldn’t pay more for a diamond with an Excellent grade – why? Because as with co many things when it comes to diamonds you have to understand the circumstances in which these grades are given. GIA and AGS (or any other lab for that matter) are inspecting diamonds under extreme conditions using extremely powerful magnification and ideal reference diamonds. The average jeweler- and even more so the average consumer- will never be able to tell the difference between a Good rating and an Excellent rating. Why pay for something you will never see and will only know exists because its written on a piece of paper?
A diamond with a symmetry rating of Good and higher is an excellent choice and will not cause any noticeable negative effect to the light performance of your diamond!