About Diamonds
To purchase diamonds one should have a good knowledge about it. In order to distinguish and understand the natural attractiveness of a diamond, one needs to compare and evaluate it. To make one understand we have tried to sum it up in the simplest form in terms of 4 C’s that is Cut, Clarity, Colour and Carat.

Cut:
Diamonds are cut in various shapes such as round, emerald, oval, pear, marquise, heart, cushion, asscher, radiant and trilliant. The major fact of a diamond's fire and overall exquisiteness is the exactitude with which it is cut. In order to enhance this brilliance a master craftsman must specifically ally each of the stone's aspects and angles in accurate statistical relation to one another. The Cut is one of the major variables out of the 4 C’s and the cut affects the diamond's value. Only the cut can bring out the maximum beauty of the diamond. Even diamonds with enclosures, when perfectly cut, appear to be dazzling gemstones.

Structure of a diamond:
Table: The top and the largest facet of a diamond.
Crown: The portion above the Girdle.
Girdle: The tiny / narrow rim that separates the crown and pavillion of a diamond.
Diameter: The width of a diamond which is measured through the Girdle.
Pavilion: The base of the diamond or the portion below the girdle.
Culet: The pointed bottom of the pavillion.
Depth: The height of the diamond i.e. from culet to the table

Clarity
Clarity indicates the purity of a diamond. A diamond's clarity is concluded by the number, nature, position, size and colour of internal characteristics which are known as "inclusions" and surface features called "blemishes". The lesser and fewer the inclusions, than more light can pass through the diamond, adding extensively to its exceptional beauty. Thus a diamond which is free of inclusions and blemishes are considered to be rare and highly priced.
Diamonds are graded under 10x magnification and are graded as below as per GIA:

F (Flawless): Free from inclusions

IF (Internally Flawless): No inclusion visible under 10x magnification.

VVS1-VVS2 (Very Very Slightly Included): Inclusions, extremely/very difficult to notice under 10x.

VS1-VS2 (Very Slightly Included): Inclusions difficult to notice under 10x magnification.

SI1 –SI2 (Slightly Included): Inclusions easy to notice under 10x magnification.

I1-I3 (Included): Inclusions that are noticeable even to naked eyes.

Colour
Diamond colour is a key factor in determining its value as well as its beauty. The diamond colour scale starts from D (no colour diamonds) to Z (for dark coloured diamonds). As a canon, if the diamond is colourless, than it is considered more beautiful and valuable. Colourless diamonds are the most attractive and popular since they allow the most refraction of light (sparkle), dispersing it again as rainbows of colour. Colour is an outcome of the composition of the diamond, and it never varies over a period of time. Diamonds are graded on a scale recognized by the Gemmological Institute of America (GIA).Basic groups on GIA’s colour scale which ranges from D to Z are as under:

D-E-F: Colourless

G-H-I: Nearly Colourless

J-K-L-M: Faint Yellow / Brown / Green / Grey

N-Below:Very Light / Light Yellow

Carat
A carat is the unit of weight by which a diamond is measured. Because large diamonds are found less commonly than small diamonds, the price of a diamond raises exponentionaly to its size. Carat is the unit of weight for all gemstones. One carat is subdivided into 100 "points. There are five carats in a gram. A 50 point diamond is 1/2 carat or .50 carats. Large size diamonds are rare and hence have greater value per carat