Symmetry

Understanding Diamond Symmetry

Symmetry refers to how precisely the various facets of a diamond align and intersect. This can include extra or misshapen facets or off centre culets and tables.

Excellent 

No symmetry defects visible at 10x magnification.

Very Good

Any defects are extremely difficult to see at 10x magnification.

Good

Any defects are difficult to see at 10x magnification.

Fair

Defects are noticeable at 10x magnification, and may be visible to the naked eye. Diamond Quarter do not sell diamonds with fair symmetry.

Poor

Defects are visible to the naked eye. Diamond Quarter do not sell diamonds with poor symmetry.

Symmetry is more important in diamonds of VVS2 Clarity and higher, since the very subtle defects produced by Fair or Poor symmetry would compromise the diamond’s otherwise perfect appearance.

Despite the negligible impact on appearance, symmetry has a significant impact on price; a diamond with Excellent Symmetry and polish may be priced 10%-15% higher than a diamond with Good Symmetry and Polish. This premium has more to do with customer’s perceived value of “excellent” grades, rather than the actual effect on a diamond’s appearance.

Because diamonds with Poor symmetry have defects visible to the naked eye, these diamonds should be avoided in all cases. A diamond should not be chosen or rejected based solely on symmetry. Because the overall Cut grade already incorporates symmetry, that should hold sway over your decision to purchase that particular stone or not. When comparing two diamonds of equal Cut grade, symmetry (and polish) can then be used to narrow down your options.