The process of selecting a diamond may seem overwhelming, but knowing the 4 C’s – carat,
colour, clarity, cut – will help you understand the characteristics of a diamond, helping you to make the perfect diamond purchase.With an understanding of this valuable information, you will be better informed to choose the perfect diamond, suited to your requirements. Whether you are looking to purchase a diamond as an investment or one to include in a bespoke jewellery design, we have a wide selection of diamonds for you to choose from.

Our experienced team at ASR Gems are here to guide you through the process from start to finish, from choosing your diamond to helping you custom design a bespoke piece of jewellery that is personal to you.


Carat is the unit in which a diamond is weighed. One carat equals to 0.2 grams or 200 milligrams. Carat weight is the prime factor that determines the weight of a diamond. Larger diamonds are undoubtedly costlier. Carat makes expressing diamond weight easier as compared to milligrams. Instead of giving three labels to diamonds weighing 20 milligrams, 211 milligrams and 220 milligrams, carat offers a category for fitting the diamonds in a one category, placing these diamonds in one-carat range.

One should not forget that high carat weight does not necessarily mean a larger looking diamond. Even diamonds of the same weight can differ on a basis of other factors, especially cut, that influences the perceived size. Large diamonds are rare to find and much in demand as compared to small diamonds even of the same quality. The price of a one-carat solitaire diamond ring is more than a ring with smaller diamonds making up the same carat weight. Diamond comparison is not effective, until you compare the diamonds of similar features and qualities. While comparing the value of different diamonds, divide the cost of every diamond in accordance with the carat weight and then calculate its price per carat.

You may have noticed your jeweller discussing ‘points’ whilst talking about diamond sizes. This is not in context to the number of facets a diamond has but to the weight of the diamond. One carat is equivalent to 100 points, so every point is 1/100th of a carat. Carat weight also influences a diamond’s price. Because of the rarity of larger stones, they are priced higher. Carat weight is an important consideration while buying diamonds.



When the jeweller talks about the diamonds colour, they are referring to the absence and presence of the colour in the diamond. The colour of a diamond is the result of diamond’s composition and does not change with time.
colourless diamonds allow light to travel through them, as compared to the coloured diamonds. These diamonds also emit more fire and sparkle. The process, through which a diamond is formed, is the deciding factor of its colour. The whiter the diamond the higher value it is likely to have.

To grade the colour of diamonds, jewellers refer to the GIA colour scale that starts the rating from D for colourless diamonds and grows up to Z, that have traces of light yellow or brown in the diamond. Diamonds graded from D to F are amongst the most desirable and valuable stones. These diamonds are a delight for the diamond lovers. Nevertheless, if you have a low budget, you can also find good diamonds with lower grades. These diamonds are not exactly colourless but show no colour to untrained eye.

Consider the setting of your diamond before choosing its grade. If the setting of your diamond is platinum or white gold, go for high colour grades. However, if you want to get it fitted in yellow gold, slightly low grade diamonds can also look great. While you will find a faint yellow tint in diamonds that are graded from J to M, the colour can be camouflaged by choosing the right setting for the stone. Many people prefer the warm glow given by low
colour diamonds.

Fluorescence is found in the diamonds whilst they are exposed to ultraviolet light with a long wave. Under most of the lighting conditions, this effect cannot be seen by eyes. Some people prefer diamonds without this effect while others look for it. It is all about the aesthetics when it comes to choosing the perfect diamond for you.



Diamond clarity means discovering the characteristics of a diamond, including the blemishes and inclusions. If you consider the way in which a diamond is created, and that they are not produced in sterile laboratory, you will be not be surprised to find that most diamonds are not flawless.

Usually, there are two kinds of flaws found in diamonds – blemishes and inclusions. Inclusions are naturally occurring internal flaws that are found in diamonds including cracks, air bubbles, and minerals. However, most blemishes occur at the time of cutting process. Diamonds that have fewer blemishes and inclusions are considered more valuable compared to those that have more flaws.

On the basis of clarity, grades are given to diamonds under loupe magnification. These grades vary from the ones that do not have blemishes or inclusions to those that do. There are different grades given to a diamond like F, IF, VVS1-VVS2, SI1-SI2 and I1-I2-I3. A Diamond’s clarity grade is proof of the identity of the diamond.

GIA certificates consist of a diamonds inclusion plot, as there is no similarity between two diamonds. The plot of the GIA certificate ensures the worth of the diamond you are planning to buy. It lets you have the assurance that the diamond you are receiving is the one you have paid for. If you are undecided about what clarity grade you should choose, flawless is the best and rarest clarity grade.

Diamonds that are VS and VVS grades are great in terms of appearance and value. You can also invest in less expensive options that include SI2 and SI1 where inclusions can also not be seen by the naked eye.



Many gemmologists believe that best of diamond cuts are made after following a formula calculated for maximizing the brilliance. The formula is in the proportions of the diamond, especially in the context of how depth compares to diameter. If you are buying diamonds without GIA certificates, invest some time to finding certified diamonds and gain some knowledge for identifying better cuts.

Variance in proportion to poor cut and ideal cut is often difficult to unearth. As cut is important, you can make use of different grading methods for determining the cut of a specific diamond. Selection of grade cut is based on a person’s preference. For making the best selection, one needs to be acquainted with different grades.

The ideal diamond cut has maximum brilliance and the small table size of these diamonds work in the best possible way to create fire or dispersion. With ideal cut diamonds, you can be sure of having the finest return on money invested. This category is just for round shaped diamonds. Premium cuts are also equivalent to ideal cuts in round diamonds but the price is slightly lower. Very good diamond cuts reflect maximum light entered in, providing a fair
amount of brilliance to the diamonds.

Good cut diamonds reflect most of the light that passes through them. The proportion of these diamonds is outside the preferred range. Diamonds that fall under this category will allow you save money without compromising on beauty and quality of the diamond. Fair and poor quality diamonds reflect the very little proportion of light that enters them. These diamonds are cut in order to increase carat weight above all other considerations.