This is the only one of the 4Cs that is not created by Nature, but is crafted by the skill of experienced craftsmen. Cut determines how a diamond reflects light, which in effect is responsible for the sparkle or brilliance, in turn significantly impacting its beauty. The cut or the “make” of a diamond refers to the angles and proportions of all the facets created while transforming a rough diamond into a polished one.


The RGS grades following 5 Cut grades description

Grade Description
ID Ideal Cut
EX Excellent Cut
VG Very Good Cut
GD Good Cut
FR Good Fair Cut

The RGS uses 3 additional aspects of Cut viz. Polish, Symmetry and Proportion, each of which is further judged on the basis of its constituent , thereby making for an accurate judgment.

Proportion further comprises of two factors defined as below

Dependent Factors:

Pavillion Angle, Crown Angle, Table size, Total Depth. Now these factors doesn’t have much individual significance they go in blend with each other. It’s their combination which makes a stone attractive; we through RGS try to mix up the combination in order to achieve the best sparkle out of stone retaining the maximum possible weight.

Independent factors:

Girdle Height, Culet, Length-width ratio, lower halves, and Star Ratio.

The polish of a diamond shows how well the diamond was finished, how clean, shiny and straight edged the facets were cut, if any traces of minute or microscopic lines or blemishes were left by the polisher plus whether any marks are visible on the stone. A well polished diamond is more brilliant than a poorly polished diamond. Other marks can also be scratches or tiny chips, diamonds may be damaged if roughly handled together. We at Royal Diam grade polish as follows:

Grade Description
EX Excellent Polish
VG Very Good Polish
GD Good Polish
FR Fair Polish

Symmetry is an important element of diamond finish. Symmetry refers to the exactness of the shape and arrangement of facets. This includes naturals, misshapen facets and extra facets, off centre culets and tables, wavy and out of round girdles, misalignment of crown and pavilion facets. To the unaided eye, finish features usually have little effect on appearance; they are like pinpoint inclusions. The importance of symmetry is less important in diamonds that have lower clarity grades. Symmetry is more important in diamonds that have very high clarity grades. We at Royal Diam grade symmetry as follows:

Grade Description
EX Excellent Polish
VG Very Good Polish
GD Good Polish
FR Fair Polish