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 Lumera 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 Lumera.
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, Lumera does not carry diamonds with a polish grade of Poor.