The first thing that determines the price of the ring is the weight of the diamond expressed in Carats (ct) with one carat being equal to 0.2 grams. A carat is divided into 100 points which means that half a carat is described as 0.50 carats.
The second important feature of a diamond is its colour which refers to the degree to which a diamond appears colourless. According to a scale established by the Gemmological Institute of America (GIA) the colour of a diamond varies from D (colourless) to Z (strong yellow or brown).
However, even a big and heavy diamond with no colour can lack shine and brilliance if it isn’t cut well. Since the quality of the cut can affect the price of the diamond for up to 40% it is definitely the most important thing to be careful about.
Out of all diamond shapes round brilliant are the most popular while marquise diamonds are perfect for maximising carat weight. Princess shape is also hugely popular with its sharp corners, while heart diamonds are the best option for romantic brides.