What is 4C?
4C in diamond refers to Colour, Cut, Clarity, Carat. Those are the important factors to determine the value of a diamond.
Professional jewelers define the colour of diamond using alphabet from D to Z, rating D represents colourless diamond while rating Z means "fancy" colour which is generally in light yellow or light brown colour. Although colourless diamonds are commonly preferred, diamonds with fancy colours can have a higher value because it is rare to find.
It is important to know that Cut does not mean the shape of the diamond. Cut refers to the quality of proportioning, polish and symmetry. The term "brilliance" is to measure the Cut of a diamond and it is determined by the roundness, depth and width. The width and depth are considered to be very important for the cut as it determines how light travels within the diamond which greatly affects the brilliance. The Cut of a diamond is graded Ideal, Premium, Very Good, Good, Fair and Poor. You should ask a professional jeweler about the cut grading if you are not sure about it.
Clarity indicates the purity of a diamond. Diamonds generally have inclusion, blemishes and other minerals but they normally cannot be detected by human eyes and trained professionals perform clarity grading using binocular magnification. Therefore, you may have a hard time to see the difference of clarity between diamonds unless the inclusion or blemishes are very obvious. You should seek guidance or check diamonds with different clarity grade in order to have a better understanding.
Carat refers to the size of the weight and carat wright measures the mass of a diamond. If all other factors are equal, the higher the carat, the higher the price of the diamond. Contrary to what the general public, Carat is not the most important factor in determining the value of a diamond. The above 3Cs are also need to be considered.