Polish and symmetry are two essential characteristics of a diamond that dictate its beauty. Besides, they are included in the grading report. These factors are essential for the craftsmanship and finish of the diamond. Below is a discussion on the polish and symmetry grading of a diamond that affects the 1 carat diamond engagement ring price.
Polish is indicative of the condition and smoothness of the diamond surface. If a diamond is well-polished, its surface produces crisp reflections and allows a smooth transition of light through it. On the other hand, poor polish quality can make the diamond look dull and unattractive.
Symmetry is the sign of perfection of the shape, placement, alignment of the facets, and the overall outline. A diamond which is not properly symmetric will look different from the intended shape. Besides, it will not allow the proper transmission of light, thereby affecting the brilliance of the same.
GIA made the observation that the symmetry grade of ‘Good’ is not preferred by the trade and consumer participants. It did not matter that they were of ideal proportions that they qualified for excellent cut ratings. As a result, GIA lets the total cut grade to be one-step higher than the polish rating or diamond symmetry. For instance, a diamond which has a “very good” symmetry might still get an overall cut grade of ‘excellent’ if the other parameters are up to the expected mark. On the other hand, the diamond with a “good” symmetry may receive “very good” cut grade at the most if the other parameters meet the required expectations.
Excellent Ratings Does Not Mean Perfection
The excellent rating of a diamond does not mean it is 100% perfect. Diamonds with faded polish lines or simple symmetry flaws could be given Excellent rating if they are within the tolerance levels.
Common Polish Features Found on a Diamond
Almost all diamonds have certain remains of polishing marks over their surfaces. The true nature of “excellent” polish diamonds is that they may contain small magnification lines that are only detectable under magnifying glasses at a certain tilt angle.
Certain important terms regarding diamond polish are as follows.
Scratch –these are the line that looks transparent and are found on the surface of the diamond.
Nick – these are minute notches found on girdle or facet junctions.
Abrasion – these are nicks found at facet junctions.
The above are some basic information regarding polish and symmetry of diamonds that will come in handy while you purchase a diamond ring.