Diamond Education

Diamond Education


Affinity Diamonds creates exquisite diamond jewellery by hand selecting the most beautiful diamonds and setting them with impeccable craftsmanship in exquisite designs.

The FOUR C’s


The 4C’s describes a diamonds specific characteristics – Carat, Colour, Clarity and Cut. It is a balance of all four of these characteristics that denote the diamond’s value and rarity.


Carat is the weight of the diamond and the metric that denotes its size. Although size is an important factor in determining the value of a diamond (the greater the carat weight, the rarer and more valuable the diamond becomes), the cut, colour, and clarity are equally important.


Colour is the hue of the diamond or the lack thereof. While white or colourless stones are traditionally used in diamond engagement rings, diamonds are found in a wide spectrum of colours. Engagement ring diamonds are graded from D to Z, with D being the prized colourless diamond. The hue of D, E and F coloured diamonds is difficult to differentiate to the untrained eye, but the amount of colour becomes more apparent as the alphabet progresses. Z graded diamonds are a pale yellow or brown colour, and anything falling outside of this range is considered a fancy coloured diamond. The colour of the metal in a mounting can either mask or enhance the diamond colour. Yellow gold makes slightly yellow or brown diamonds appear more colourless. If a diamond is mounted in white gold or platinum, the colour becomes more apparent


Clarity is a judgment of the internal presence of inclusions (birthmarks) and the external visibility of blemishes. These make each diamond individual and unique. The regularity, size, nature, and position of these characteristics is considered and graded on a scale of F (Flawless/no inclusions) to I3 (inclusions apparent to the naked eye). These are graded according to GIA, the worldwide standard for grading gems.


Rather than describing the shape  of a stone, cut refers to the proportion, symmetry brilliance and polish of a diamond. This means that the diamond cutter has taken into account the inherent characteristics of each individual stone and chose the best way to shape it to accentuate its beauty.


It is very essential to know Diamond Anatomy before understanding Cut.


Diamond Anatomy


  • Diameter: Width of a diamond measured through the Girdle.
  • Table: Largest facet of a gemstone.
  • Crown: Top portion of a diamond extending from the Girdle to the Table.
  • Girdle: Intersection of the Crown and Pavilion which defines the perimeter of the diamond.
  • Pavilion: Bottom portion of a diamond, extending from the Girdle to the Culet.
  • Culet: Facet at the tip of a gemstone. The preferred Culet is not visible with an unaided eye (graded “none” or “small”).
  • Depth: Height of a gemstone measured from the Culet to the Table.


A diamond gets its brilliance and scintillation by the cutting and polishing of its facets, allowing the maximum amount of light that enters through its top to be reflected and dispersed back through the top. Cut has the following 3 components:


Diamond Cut by Shape


Cut is the appraisal of the diamond’s facets and the ability of these to transmit light and sparkle. A Diamond Cut by Shape describes the outline of the stone and pattern of the facet arrangement. Did you know that over 75% of all diamonds sold are round brilliant cut?


The most popular and stylish shapes are defined as:

Round Brilliant Cut

The Round Brilliant Cut diamond is the most traditional and popular of all the diamond shapes.
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Princess Cut

Second only to the round brilliant diamond in popularity is the square-shaped princess cut diamond.

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Emerald Cut

The Emerald Cut diamond is a square or rectangular shaped stone with cut corners.

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Oval Cut

The Oval Cut is also a beautiful shape and provides great brilliance and fire through its 56 facets.

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Marquise Cut

The Marquise Cut is a traditional shape having elongated ends at both edges.

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Pear Cut

The Pear Cut diamond is often called a teardrop due to its single point and rounded end with 56 to 58 facets.

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Asscher Cut

The Asscher Cut is a modified version of the Emerald Cut.

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Radiant Cut

The Radiant Cut is a rectangular or square stone with cut corners.

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Heart Cut

The human heart is the ultimate symbol of love and the Heart Cut is regarded as the most romantic of all the shapes.

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Cushion Cut

Cushion Cut diamonds are also known as “pillow cut” diamonds.

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Trilliant Cut

The Trilliant Cut is one of the unusual cuts and the diamond with this shape displays a very sharp brilliance or fire.

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Diamond Cut by Depth


With proper cutting (diagram 1 below) the light passes through the top, bounces off the sides, and then travels back out the top, giving the diamond optimum brilliance. If the diamond is cut too deep (diagram 2), light passes through the side of the diamond. If the diamond is cut too shallow (diagram 3), light passes through the bottom of the diamond, also inhibiting maximum brilliance.


A poorly cut diamond will lack the lustre and glow of its premium-cut counterparts, and for this reason, master diamond cutters will often sacrifice carat weight to improve the cut of a stone.




Diamond Polish and Symmetry


Polish and symmetry are two important aspects of the cutting process. The Diamond Polish expresses the smoothness of the diamond’s facets where as the Symmetry refers to alignment of the facets. A poor Diamond Polish, or rough facets, can diminish a diamond’s brilliance, as well as its value.



Acquisition of a Diamond or Diamond Jewellery is an important expression of love or accomplishment but at the same time it also represents a major investment of money.


It is essential for you to know the credentials of the diamond and obtain confidence in the integrity of what you have acquired.


A Diamond Certificate or Diamond Grading Report is a statement, issued by an independent Gemological Laboratory, that at the time of evaluation, the diamond in question has been examined, measured, and scrutinized by experienced Diamond Graders, using various gemological instruments, and determined to contain the characteristics as stated in the Certificate or Report.


In other words, a diamond certificate can be accurately described as the blueprint of a diamond.


This Certificate or Report includes an analysis of the diamond’s characteristics in an easy to understand format.  This certificate doesn’t state monetary value of a diamond.