Diamond Symmetry

Symmetry refers to how precisely the various facets of a diamond align and intersect. This can include extra or misshapen facets, off center culets and tables, and wavy girdles. Sometimes, a diamond cutter will deliberately allow a minor reduction in symmetry as a way of preventing a defect present in the rough stone. Symmetry typically ranges from 'Poor' to 'Excellent'.

Symmetry has a limited impact on the appearance of a diamond and a greater impact on price. A diamond with 'excellent' symmetry and polish may be priced higher than a diamond with 'good', 'fair' or 'poor,' because they are perceived as more valuable. A diamond with a lower symmetry grade will also have a higher probability of noticeable defects.

Each Fine Jewelry Pros Diamond™ Certificate displays the symmetry grade, using the following scale:

Excellent	No symmetry defects visible under 10x magnification.	Fine Jewelry Pros Diamonds
Very Good	Any defects are very difficult to see under 10x magnification.	Fine Jewelry Pros Diamonds
Good	Any defects are difficult to see under 10x magnification.	Not carried by Fine Jewelry Pros
Fair	Defects are noticeable at 10x magnification, and may be visible to the unaided eye.	Not carried by Fine Jewelry Pros
Poor	Defects are visible to the unaided eye.	Not carried by Fine Jewelry Pros