Why are the 5Cs - cut, colour, clarity, carat and certification - important to you? The 5Cs are used throughout the world to classify the rarity of diamonds. Diamonds with the hightest 5C ratings are more rare and consequently more valuable.
Light is the element which ignites a diamond's brilliance and fire. The interplay with each of the 5Cs will help explain why one diamond can appear more beautiful than another. The good news is that you don't need to buy the rarest diamond to find one that speaks to you.