Diamonds are graded using a universal system that assesses the stone on its colour, clarity, cut and carat-weight, commonly known as the ‘Four Cs’. Every diamond, no matter how large or small, has a set of unique characteristics that determine its value.


Gradings of the 4 C’s help determine the value of a diamond and indicate its quality. Diamond sellers often set their prices based on a grading report, known as the Rapaport Price List The Rapaport Price List, informally known as the Rap List or Rap Sheet, is the diamond industry standard for the pricing of diamonds. The report is updated every week and prices are listed in dollars. Therefore, the price of diamonds continuously fluctuates.

Lab-grown diamonds are also priced internationally according to the Rapaport price list. Our prices are based on the Rapaport price and the dollar-to-rand exchange rate, therefore they are subject to fluctuation. Our prices are approximately 65% off the Rapaport price.


  1. Cut: Quality of the angles, proportions, facets, and finishing details.
  2. Colour: How colourless the diamond is. 
  3. Clarity: How clean the diamond is of inclusions and blemishes.
  4. Carat: The weight of the diamond.


Carat: The Most Visual C – Size

Diamond carat is its weight and reflects the diamond’s size. The larger the diamond, the rarer and more valuable it becomes. Carat is the most visible C. Not to be confused with karat (a measure of gold purity), a 1.00 carat or ct diamond weighs 0.20 grams. The size of a diamond is measured in millimeters by length and width or in other words the diameter of the diamond.


Colour: Diamond’s Shade or Tint

Colour refers to the presence or absence of a yellow or brown tint in white diamonds. The closer a diamond is to colourless, the more valuable it is. Most diamonds appear colourless to an untrained eye, yet many have slight tones of yellow or brown which affect its value. Because lab grown diamonds are created in a highly controlled environment, they are engineered to be colourless or near colourless.


Clarity: The Diamond’s Unique Imperfections

During the diamond growth process, microscopic impurities or imperfections become present within the diamond. These imperfections are known as diamond inclusions. Clarity measures the incidence of natural inclusions or imperfections found in a diamond. 

The closer a diamond is to flawless, i.e.: no inclusions visible through a jewellers loupe, the more rare it is and the greater its value. Most inclusions are not visible to the naked eye, so diamonds are examined under a 10x magnifying loupe to determine their clarity. Inclusions are extremely common within diamonds and are essentially birthmarks that give every diamond uniqueness. The inclusions cumulatively make up the diamond’s clarity. This clarity is measured by gemologists and graded on a scale.

Diamonds range in clarity from FL – I3. Again, lab grown diamonds are exposed to less impurities during their growing process and thus have fewer imperfections than mined diamonds.



Cut: The Diamond’s Sparkle

Diamonds are cut to maximize the sparkle, fire, brilliance and overall visual beauty of a diamond. The cut is a measure of light performance as light hits a diamond. Diamonds sparkle is a result of light performance. As light hits a diamond, it penetrates the diamond, bounces around and reflects within the diamond and ultimately returns light to your eye. That is the sparkle that you see. The cutting of a diamond directly impacts the amount of light performance achieved. The angles, locations, sizes and shapes of facets will determine the diamond sparkle.

How are Lab-Created Diamonds Graded?

Lab-grown diamonds can look exactly the same as natural diamonds to the unaided eye. Their identity can usually only be determined by gemological laboratories using specialized instruments. 

These instruments detect minor differences in trace elements and crystal growth to determine whether a diamond is laboratory-grown or natural. Laboratory-grown diamonds undergo the same rigorous grading process as natural diamonds. 

Our diamonds are graded by either GIA or IGI which are the most well-respected and well renowned diamond grading entities in the world. Every single Milla Rosa diamond comes with an authentication and grading certificate from one of these agencies.  

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