Polish refers to the degree of smoothness of each facet of a diamond as measured by a gemologist. When a diamond is cut and polished, microscopic surface defects may be created by the polishing wheel as it drags tiny dislodged crystals across the diamond’s surface. Depending on the severity, these defects may disrupt light patterns as the light rays enter and exit the diamond.
Each Pure Diamond displays the polish grade as determined by the GIA, using the following scale:
|No polish defects visible at 10x magnification.|
|Any defects are extremely difficult to see at 10x magnification.|
|Any defects are difficult to see at 10x magnification.|
|Defects are noticeable at 10x magnification, and may be visible to the naked eye.|
|Defects are visible to the naked eye. Not offered by Pure Diamond.|
For diamonds with a polish grade of Excellent to Good, any polishing defects are not visible to the naked eye, and should have no impact on the diamond’s overall appearance.
For diamonds with clarity grades of I1 or lower, even a polish grade of Fair is acceptable, since these diamonds already possess internal inclusions that are visible to the naked eye, making any polish markings less relevant.
For diamonds less than .75 carats, any polish grade of Fair or better will not affect the appearance of the diamond to an untrained observer.
Poor is the only polish grade that should be avoided regardless of the size or clarity of the diamond. For this reason, Pure Diamond does not carry diamonds with a polish grade of Poor.
Symmetry of the Diamond Facets.
All symmetry diamond evaluation is performed under magnification of 10X
While the loose Diamond is held in gemstone tweezers, symmetry refers to the exactness of the shape of a stone and the arrangement of the facets. The parameters listed below represent the symmetry grade categories.
– (minute facet symmetry features)
Diamonds with an EXCELLENT symmetry grade does not display ANY facet misalignment, pointing or misshapen facets. This grade is the testament to the diamond manufacturers skill and experience.
– (minor facet symmetry features)
A stone with slight symmetry features when viewed at 10X magnification.
Diamonds with a VERY GOOD symmetry grade might have slight (minor) misalignment, pointing, very slight misshapen facets. This grade is only one step away from Excellent, it represents a better value, as the stones with Very Good grade tend to be slightly cheaper yet the difference is not noticeable to the untrained eye.
– (noticeable facet symmetry features – minor proportion symmetry features)
Diamond with more discernible symmetry features when viewed at 10X but not affecting the stone’s overall appearance. Noticeable misalignment, pointing, misshapen facets. Slightly off centre culet, table, out-of-round, uneven outline, or wavy girdle.
Please note purediamond.ca does not sell FAIR or POOR symmetry graded diamonds as the symmetry features defect the overall appearance of the diamond. The stones with these grades while always cheaper do not represent a good value.