Humans have the tendency to classify materials and products for the ease of understanding and more importantly to decide a value for that product. Similarly diamonds are also classified in order to derive a value. After a very long period of studying diamonds, a leading laboratory called GIA- Gemmological Institute of America formulated the 4Cs.

This basically means one can derive a value of a diamond in monetary terms, if one knows the 4Cs of that diamond. Now let’s see what the 4Cs are that decide this rare and precious stone’s value.


As you may know, diamonds are made of a single element – Carbon. Due to the presence of other elements (called trace elements) around them during the formation process, diamonds get their colour. It means that lesser colour in a diamond, the more chemically pure and structurally perfect it is. The colour grading system starts from D, representing colourless and with increasing amounts of colour, it goes till Z. Only a trained eye for diamonds can tell the difference between two colour grades. There are also diamonds that are fancy coloured. They do not belong to the normal D-Z colour range and are highly priced due to t


Natural diamonds are a result of extreme pressure (40-70 kilo bars) and temperature (about 1200 degree Celsius) conditions very deep below the earth’s surface. During this process diamonds get internal characteristics called inclusions and surface characteristics called blemishes. Considering these ‘characteristics’ as ‘impurities’ would not be correct. In fact inclusions and blemishes are like a diamonds fingerprint making every single diamond on this plant unique. There are broadly 6 categories – Flawless (F), Internally Flawless (IF), Very Very Slightly included (VVS), Very Slightly included (VS), Slightly Included (SI), Included (I).
To a naked and untrained eye, a VS and SI diamond would look exactly the same. Only a trained diamond expert can easily and accurately tell the difference.


Diamonds are known for their excellent ability to transmit light and sparkle so strongly. Cut of a diamond in simple terms is its ability to return light to the viewer’s eye. Diamond factories have advanced technologies to cut and facet a rough diamond and turn it into a polished one. The cut grade is a collective result of a diamonds angles and measurements like crown angle, pavilion angle, table percentage etc. The quality of its polish and symmetry in angles and sides are also important factors.

The cut grade ranges from Excellent (EX), Very Good (VG), Good (G), Fair (F), Poor (P). Excellent (EX) grade having the most ideal measurements and therefore maximum light return, while Poor (P) grade having poor me


A carat is an international unit of diamond weight. Diamonds are not weighed in grams of kilograms but carat weight. Internationally, 1 carat equals 0.2 grams. Every carat is divided into 100 points (or 100 cents). For example, if a jeweller tells you that a particular ring has a diamond 1.10 carat, it means the diamond weighs 1 carat and 10 cents or 0.22 grams.

Diamonds of increasing carat weights are increasingly rare and therefore highly valued. There is a simple formula used to determine the cost of a diamond (Cost = total weight * per carat weight). 2 diamonds of the same carat weight can be of different values depending on the other 3 Cs.