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The 4Cs

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Welcome to our Diamond Education hub. We are industry experts and a highly valued and reputable knowledge base on gemmology and diamond jewellery. In this section we include everything from the early history of diamonds to revealing our current techniques for creating fine, gem set and diamond jewellery and engagement rings.

The 4c’s of diamonds

Colour, Clarity, Carat & Cut are vital when determining the quality of a diamond. These quality categories contain information such as inclusions, weight, shape, cloudiness. All of these factors affect the stone’s visual appearance and price.


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Our diamonds are colour graded in GIA laboratories, compared to round brilliant diamonds called master stones. The clearer the diamond, the higher the value. The whitest, most desirable and highest rated colour grade is D. The diamond’s colour impact could be lowered or concealed by other features, such as clarity and fluorescence.

  • White
  • Fancy

Colour: G

  • I
  • H
  • G
  • F
  • E



Clarity comprises the stone’s imperfections, also known as inclusions. The less imperfections a diamond has, the higher the clarity grade. It is extremely unlikely for a diamond to be entirely flawless, as almost all include trace minerals or other internal features affecting their clarity rating. In fact, flawless diamonds are so extraordinary, many jewellers have never even seen one.


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The carat is the diamond’s most popular feature and refers to the stone’s weight. Unlike popular beliefs, the carat doesn’t necessarily reflect the value, nor the apparent size. Size varies depending on other diamond aspects, such as cut and shape. However, larger diamonds are rarer than smaller ones, therefore are valued higher. Use the interactive guide below to demonstrate the size in mm of different carat weights for each shape of diamond.

Size shown in MM

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  • Round
  • Princess
  • Emerald
  • Oval
  • Pear
  • Heart
  • Marquise
  • Cushion
  • Radiant

Size: 0.25ct



The diamond’s cut is the most significant of all features. It refers to the stone’s shape viewed from above and affects its brilliance and light dispersion. Diamond cutting requires absolute precision and superb craftsmanship – perhaps it is one of the most important processes in the art of making diamond jewellery. Understanding how the cut works to capture and reflect light is the key to finding the perfect diamond engagement ring.


Cut: Poor



Diamond shape

Steven Stone’s collection offers a wide selection of  engagement rings,  wedding rings, pendants and earrings with diamonds in various shapes.


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Diamond certificates

After a rough diamond is extracted from the ground, it is assessed to determine its suitability for being cut into a specific shape. Only when it has been cut, finished and polished it can be graded by a Gemologist, with quality proven by a diamond certificate. Diamonds are assessed under controlled conditions, based on their characteristics such as colour, polish, dimensions. Steven Stone sells only diamonds certified by GIA – the strictest grading body with the highest ethical standards and integrity of certification.


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