J.B. Grading System
Our diamonds pass through rigorous quality control and are assessed finely by qualified craftsmen. Each flawless diamond complies with stringent specifications of color, clarity and shape.
  • Polish (PO)
  • Symmetry (SY)
  • Bowtie
Polish (PO)
Polish can be result of the finishing process or be affected by blemishes created after cutting. The term "Polish" refers to the degree of "polishing lines" that appear on the surface of a finished diamond which can be seen with the use of 10x magnification. These polishing lines are caused by the minute diamond crystals which are embedded in the polishing wheels used by the diamond cutters to polish the surface of the diamond after cutting. While not quite the same in appearance, they are similar in concept to the swirl marks left on the surface of a car from the use of an orbital buffer, but are much less noticeable.
It is important to note, however, that polish lines are straight in appearance.
Code - polish Description
(ID) IDEAL This is our predilection. No polish lines or marks are visible when the diamond is viewed under 10x magnification. High magnification, such as 30x may be used to locate any possible imperfections. The brilliance of a diamond with Ideal Polish will be noticeably superior to that of a diamond with a polish rating of Excellent.
(EX) EXCELLENT This is our preference. No polish lines or marks are visible when the diamond is viewed under 10x magnification. High magnification, such as 30x may be used to locate any possible imperfections. The brilliance of a diamond with Excellent Polish will be noticeably superior to that of a diamond with a polish rating of Very Good.
(VG) VERY GOOD Represents diamonds that contain one or two minor groupings of transparent polish lines that are visible under 10x magnification. Higher magnification will again be used to locate these areas easily. The degree of brilliance between a diamond graded as Very Good in Polish and Good is still noticeably different.
(GD) GOOD Numerous areas consisting of minor transparent lines are visible under 10x magnification. Occasional white polish lines may also be visible, but limited in number. As a bare minimum, we recommend that a diamond have a Polish Grade of Good or better. However, it is important to note that it is difficult to have Excellent or Very good polish in most of fancy shape diamonds so generally it carries Good polish.
Symmetry (SY)
Symmetry refers to the precision with which the facets of a diamond are aligned with each other and the consistency of facet shape and size per given section. The symmetry rating reflected on a diamond grading report is not an indication of the proportions of a diamond.
Code Description Image
(ID) IDEAL No misshapen or miss-aligned facets are visible when the diamond is viewed under 10x magnification. High magnification, such as 30x may be used to locate any mis-aligned or misshapen facets. The brilliance of a diamond with Ideal Symmetry will be noticeably superior to that of a diamond with a symmetry rating of Excellent.
(EX) EXCELLENT No misshapen or mis-aligned facets are visible when the diamond is viewed under 10x magnification. High magnification, such as 30x may be used to locate any mis-aligned or misshapen facets. The brilliance of a diamond with Excellent Symmetry will be noticeably superior to that of a diamond with a symmetry rating of Very Good.
(VG) VERY GOOD Represents diamonds that contain one or two minor symmetry characteristics that can be found under 10x magnifications. Higher magnification will again be used by the grader to locate these areas easily. The degree of brilliance between a diamond graded as Very Good in Symmetry and one graded as having Good Symmetry is still noticeably different, however, it is practically impossible for the average consumer to distinguish between Very Good and Excellent or Ideal Symmetry without a lot of coaching.
(GD) GOOD Numerous inconsistencies of facet alignment and shape are visible under 10 x magnifications. As a bare minimum, we recommend that a round brilliant cut diamond have a symmetry rating of Very Good or better. However, it is important to note that it is difficult to have Excellent or Very good symmetry in most of fancy shape diamonds so generally it carries Good symmetry.
Bowtie
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J. B. And Brothers Pvt. Ltd. is a Group Company of Yaelstar B.V.B.A., a Sightholder of the De Beers Group of Companies