Every piece of diamond holds a different story and history of its own. All the people who buy the diamond are mostly concerned with the end product of the diamond. The first basic thing to consider while buying a diamond is its “quality”. To judge the quality of a diamond, it is necessary to know about its 4Cs. What are 4C's? 

The 4Cs are:

• Colour
• Clarity
• Cut
• Carat weight

These are the four basic necessary things one should remember and look into most importantly before buying a precious diamond. If any of the things out these is not present in good quality, then you’ll end up spending some precious amount of your money on the wrong stone. Its not about choosing a diamond, but choosing the right diamond. 

Colour

The basic natural colour of a diamond varies from colourless to very light yellow. By a naked eye, it can be difficult to differentiate in the colour. Having high level of nitrogen causes the diamond to have that yellow colour to it which also contributes to its impurity as well. And excess of boron can give it a bluish tint to the diamond. Some radiations can also cause the diamond to acquire a greenish colour as well. Different natural conditions can influence the tint of the stone.

Colourless ones being the most pure and rare, are the most expensive one. 

Setting aside the mindset, these coloured diamonds are also real. Some natural conditions, give the colour to the diamond. Excess or less or some mineral can result in this phenomenon. 

Clarity

A Diamond is a sparkling stone with elements in it. Elements that cannot be seen with a naked eye and are microscopic. Clarity of the stone measures the rarity and purity of the diamond. A diamond is pure and any kind of inclusions, which are the internal flaws, contributes to its poor clarity. It is the pure clarity of a diamond which gives it the sparkling shine to it. 

A pure diamond has no inclusions, i.e. no other impure substance is added or present in the diamond. One should look into and get the clarity of the stone checked thoroughly before making the investment. Any kind of impurity would result in decline in the value of the diamond. The diamond should be flawless with no inclusions of any alien material.

Cut

You cannot extract the diamond in a favourable shape from deep ends of the earth. A particular design or shaping guide is used while giving a brilliant cut to the diamond. This also reflects the final beauty and look of the diamond and signifies its value as well. After a cut, the value of the diamond is measured by its brightness and shine that flows from it. Its ability to scatter the white light into all the colours of rainbow is also important factor to be considered. 

Its thickness, shape, depth, angle etc, all contribute to its value after getting its shape. A cut is often misinterpreted as the shape of a diamond. But a particular shape which considers the depth and symmetry of the stone is what the cut is. The final polish of the gem is something that gives it the beauty that it has.

Carat Weight

A diamond is a gemstone. To measure the weight of a gemstone, carat unit is used. It is signified as “ct.” One of the major factors to determine the price and value of the diamond is carat weight. How much of the value the diamond holds, is told by its carat weight and further the value tells you, its price. While making an investment through diamonds, carat weight should never be ignored as it always reflects its rarity as well.

One carat is equal to 0.200 grams or 1/5 grams and is subdivided into 100 points. The most carat weight is 1.25 ct to 1.0 ct. A high quality cut can make a diamond appear larger with a less weight. The renowned and the most valued diamond- Kooh-I-noor was originally of 793 carat and subsequently has been trimmed and polished into a 105.6 carats as of now.