Diamond Grading

/ˈdʌɪəməndgrad”ing/defining the quality and value of a diamond

The Diamond Works grades, defines and searches for the perfect diamond proportion, polish and symmetry.

The ‘4C’ Diamond Charts clarify the standard for setting apart a diamond from a stone.

The “4C’ standard observes; Cut, Colour, Clarity and Carat weight of a diamond as to define the value of a single individual stone based on the characteristics as per the quality categories.

All diamonds carried by The Diamond Works are internationally certified.

The ‘4C’s are the standard used to value or price a gem quality stone, white diamonds are measured upon the scales below to valuate;

The overall value of a diamond is defined by the total characteristics in relation to one another.  A diamond’s proportions are the dimensions and angles of a faceted diamond and how these relate to one another. There are a range of proportions which fall within each cut grade and these variants result in attributes that are referred to as the stone’s brightness, fire or pattern. “Sparkle”, “fire”, ‘brightness” and “pattern” are terms used for diamond appearance of a cut and polished stone. The overall look and presence of a diamond which is of gem quality can be measured in overall visual appeal and these are the optical terms explained in accordance with GIA.


Brightness – often called brilliance – is the effect of all the diamond’s internal and external reflections of white light, best observed under diffused lighting. Well-cut diamonds are brighter than poorly fashioned ones, even if they’re of equivalent size, color and clarity. In general, the brighter a diamond is, the higher its grade will be.


Fire results when white light traveling through the diamond is dispersed into its rainbow of spectral colors. Look for red, blue, yellow or orange flashes as you rock and tilt it under store spotlights.


Scintillation is a combination of sparkle and pattern. Sparkle refers to the spots of light that flash when the diamond, you or the light source moves. In an attractive diamond, the reflections should appear even and balanced in size.


Pattern is the relative size, arrangement and contrast of bright and dark areas that result from a diamond’s internal and external reflections. There must be enough contrast between the bright and dark areas to give the pattern a crisp, sharp look, but no distracting dark areas.


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