The 4C's stand for Carat, Clarity, Colour and Cut and refer to the official techniques used to grade a diamond. Each diamond that we use is certified by an official body such as the GIA and have been examined against these criteria by a qualified gemologist, so you can have confidence that the diamond you take home is exactly as described. Understanding what each of the 4C's refers to will give you all the background knowledge you need when shopping around, and along with the help from our in store team will guide you to land on the right stone for you.

Allure Jewellers 4C's Education - Diamond Carat

Diamond Carat

Contrary to popular understanding, a diamonds carat refers to its weight as opposed its size, although in most cases the higher the carat the larger the diamond. Dating back to the 16th century, jewellery was measured using carob seeds which were thought to be a reliable counterweight due to the little variance in their mass, which explains where the name carat originates from. Of course there are many factors that make up the beauty of a diamond besides its weight and appearance in size, perhaps one the largest contributing factors is the skill in cutting the diamond to accentuate its natural beauty and optimise sparkle. 

Allure Jewellers 4C's Education - Diamond Clarity

Diamond Clarity

As the diagram above illustrates, the clarity grading of the diamonds Allure Jewellers work with run from Flawless to Slightly Included, and refers to the absence of imperfections and blemishes in the stone. Each diamond is evaluated for the number of both internal and external inclusions, the size, position and nature of these characteristics, as well as the impact they have on how the stone appears.


Allure Jewellers 4C's Education - Diamond Colour

Diamond Colour 

 A diamond pure and perfect in structure will have no colour at all, completely clear in appearance. The grading starts at D as an exceptionally white diamond and works through alphabetically through to J the more colour a stone is graded to have. These differences in colour are a component that effects how expensive a stone will be. The clearer the diamond, the higher in value it becomes. When visiting us in store we will be happy to guide you through the options and to the right grade of diamond to suit your requirements and budget.


Allure Jewellers 4C's Education - Diamond CutDiamond Cut

Different to the shape of a diamond, a diamond's cut is skilfully crafted to maximise its interaction and transmission of light. It is a complex process with many considerations to achieve the best cut for each individual stone. A master craftsman will work at the depth, the table, the height and angle of the crown and its girdle thickness. Each of these factors along with others will affect the grading of a stone as well as its durability and the way it directs light.