Diamond polishing is one of the factors that affect cut quality of diamond, other factors being cut proportions and symmetry of facets. So, it is important in understand about diamond polishing in order to understand cut quality of diamond.
Diamond Polishing is graded on the basis of:
Almost, all cut diamonds show polishing marks. But these lines are very fine and can be seen only by 10X or more magnification.
Polishing lines are formed during cutting process of diamond. These marks are the result of a diamond’s hardness being dependent on crystallographic directions. Hardness of each facet of diamond is different from other.
Since, cutter can set only one facet on the polishing wheel at a time, direction of polishing marks is same throughout a facet but their directions change with different facets.
Polishing lines can be seen when viewed from opposite side of the diamond. Polishing marks on the table of a diamond can be seen though the pavillion. If the relevant surface is slightly tilted and slowly moved under the light, the marks are visible in the reflected light. Polishing lines adversely affects the brilliance of diamond and reduces its transparency.
|Polishing Lines on Table|
Diamond Polish Grades
Based on quality of polish, diamond is graded under following five categories:
Important considerations while choosing between different Polishing Grades
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