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Diamond Buyer’s Guide

Before buying a diamond the knowledge of 5-C’s (Cut, Color, Carat, Clarity & Certificate) is the most common guide used for buying and selling diamonds. As a collectible, one diamond may appeal to one person and not to another. It is important that you choose a diamond that satisfies your taste.

The quality of a diamond is defined by means of the 4C’s: Carat (Weight), Clarity, Colour and Cut. These characteristics do not only determine the stone’s quality, they can also be very useful in identifying the diamond, since every diamond is unique.

But, before to know more about all the C’s you have to know one more ‘C’- Cost (Budget).

When looking to purchase a diamond, first determine what your price ranges. Stay away from companies that try to tell you what your cost should be based on i.e., monthly income. Your cost should be based solely on what you feel comfortable with. Most companies will allow you to upgrade your diamond in the future and give you a full credit for your original purchase.

One commonly asked question is how to figure the prices per carat of diamonds. The price of a diamond will reflect rarity factors as well as overhead expenses of the seller. Some rarity factors depend on size (larger is rarer than smaller), clarity (less imperfections are more uncommon), colour (colourless is less frequent) and cut (good proportioning gives greater brilliance). Each of these factors is discussed below.


You have to decide that what shape of Diamond you wants to purchase? The most common shape is round or RBC (round brilliant cut). Others are Marquise, Pear, Baguette, Princess, Emerald, Oval, Radiant etc. For more detail….

The cut of a diamond is very important in determining the beauty of the stone. The cut comprises of the depth, width, various angles and proportion. A round diamond has 57 facets (each cutting part called ‘facet’ & with individual name). The proportions and finish grade of a diamond establish the quality of the cut. A good finish grade testifies to the workmanship of the diamond polisher. It refers to the symmetry of the facets and their overall finish. The best cut diamonds also have the right proportions between the different parts of the diamond. When the cuts are placed precisely within certain mathematically calculated angle, light that enters the diamond will be reflected back out of the top in a brilliant prismatic result. If these proportions are not optimal, the fire and brilliancy of the diamond are affected, and undesirable visual effects might occur.


Describes the amount of colour the diamond contains. This can range from colourless to yellow with slight tints of yellow, grey or brown. Colours can also range from intense yellow to brown.The intensity can vary from nearly colourless, which is preferable, to decidedly yellow. The value of a white stone is higher than that of a yellowish stone. However, diamonds can also have a distinct orange, brown, pink, green or blue colour. These colour diamonds can be extremely valuable. If there are natural red, blue or green colours in diamond they more valuable than white.

Be aware!  It is possible to influence the colour by irradiation treatment followed by heat treatment. This method is not recommended for two reasons. The first is the risk involved with exposure to irradiated objects. The second is the risk of colour change over time. All colour treated diamonds must be disclosed as such prior to sale.

Contrary to popular belief, a diamond appears not only in the typical colorless or near colorless form, but actually varies from “white” to a “light yellow” color. Graded on an alphabetical scale, the color grade begins at D and ends at Z. However, fancy colored diamonds are graded on a completely different scale.


The clarity of a diamond is determined by the number, size, brightness and location of the
internal and external characteristics, important structure phenomena and transparency. Generally speaking, mainly the inclusions in the stone affect the clarity. Obviously, the fewer inclusions or structure phenomena the stone displays, the higher the quality of the diamond.

Grade Meaning Definition
FL Flawless Free from all inclusions or blemishes under 10x.
IF Internally Flawless No inclusions visible at 10x magnification.
VVS-1 Very-Very Slightly Included -1 Inclusions those are extremely difficult to locate under 10x.
VVS-2 Very-Very Slightly Included -2 Inclusions those are very difficult to locate under 10x.
VS-1 Very Slightly Included -1 Minor inclusions that are difficult to locate under 10x.
VS-2 Very Slightly Included -2 Minor inclusions those are somewhat difficult to locate under 10x.
SI-1 Slightly Included -1 Noticeable inclusions those are easy to locate under 10x.
SI-2 Slightly Included -2 Noticeable inclusion those are very easy to locate under 10x.
I-1 Included -1 Obvious inclusions. Somewhat easy to locate with the unaided eye.
I-2 Included -2 Obvious inclusions. Easy to locate with the unaided eye.
I-3 Included 23 Obvious inclusions. Very easy to locate.


Carat refers to the weight of a diamond. Carat is the 5th part of a gram. A carat is further subdivided in 100 cents (sometimes called – points). The value of diamond is depends on its size. The bigger diamond is more valuable as smaller pieces.

Certificate – The 5th ‘C’:

Another important thing to consider in purchasing or selling a diamond is the diamond certificate or grading report. It is a vital document that proves the authenticity and quality of the diamond being bought or sold. A highly trained diamond grader evaluates and specifies the attributes of the diamond. Most of the people don’t know 4‘C’s of diamonds. The Certificate provides genuine details of a diamond issued by any Neutral Organisation called Lab.

A diamond that is certified by a reputed laboratory provides a person confidence, feeling of security & relaxed mind to purchase a Diamond or Jewellery.  Not only retailers can establish themselves as trustworthy & reliable trader; but it protects consumer from misleading & honest Jewellers from unfair competition.

At any laboratory each diamond is analyzed by well experienced & skilled diamond graders with latest equipment’s. And as a result of it, each report given gets a touch of accuracy. Detailed description of every diamond like proportion, symmetry & polish, grading of cut, analysis & grading of clarity & colour are precisely described in the report.

 Valuation:All 4C’s are taken into consideration at the time of diamond valuation. Diamond with good Cut, Colour, Clarity and Carat weight is the most critical factor in determining price. Apart from the scarcity of the bigger stones is that while fashion and local taste may affect the desirability of colour and the extreme rarity of the truly flawless diamond increases the demand for slightly less perfect stones, weight remains the only constant and easily calculable factor under the grading systems most commonly used today. There is one advantage in seeing a diamond in its setting and that is setting itself may provide a valuable due to the nature of the stone.

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