7 December 2019

7 C’s to selecting the right diamond for your engagement ring


7 December 2019

Traditionally, there are 4 things to take into consideration when selecting the right diamond for your engagement ring. Cut, Carat, Clarity and Colour. But here at Custom & Co Jewellery we like to add in a bonus 3.

We continue to look at ways we can help you find the perfect ring and that is why we offer a 'Perfect Match' Advice Service. We focus, not only on 4 C’s but the 7 C’s, introducing: Cost, Certification and of course, Custom & Co. 

Custom & Co.

The first 'C' on your list should be Custom & Co Jewellery. We know it can be daunting to find the perfect ring to your budget. There is so much information to consider, do you buy online, do you buy from straight from the shop or do you make your own? It can be overwhelming to make the right decision. Here at Custom & Co Jewellery, we take away the stress and offer a ‘perfect match’ advice service. We can guide you through the whole process. We will show you the full range of certified diamonds and will explain the details of each one. You can physically see and feel the size, weight, and sparkle. You can personally select the one that fits your budget. Along with certified diamonds we use a fairtrade gold and all of our rings are hallmarked to ensure you have the best quality rings that you can treasure for a lifetime.


Most people have a budget when they are buying a ring. Diamonds are available at a huge range of prices. It doesn’t matter if you have a huge budget or a small budget, we can help you find a diamond that is right for you. The cost of your diamond will depend on the clarity, colour, cut and carat of a diamond. If you are more interested in the size of the ring, you can focus more on the carat. The carat defines the size of the stone. If you prefer to know you have a flawless diamond you can focus on the clarity and colour to ensure you have a perfect sparkle. People also often think buying a ring online is the cheapest option, however making a custom shaped ring is becoming the norm and is far cheaper than people expect, with the added bonus of being unique to you.


It is crucial when choosing a diamond to review the diamond certificate, referred to by diamond grading laboratories as a grading report. A diamond certificate is the evaluation by a third-party, not by either the diamond buyer or seller. If the diamond is not certified, there is a good chance you may be buying a stone that is one or more grades below stated values in terms of carat weight, color, clarity, or cut. A diamond certificate is the evaluation by a third-party, not by either the diamond buyer or seller. 

Several well-known grading agencies in Europe and the United States that have high reputations:

 - Gemological Institute of America (GIA)

 - American Gemological Society (AGS)

 - European Gemological Laboratory (EGL)

 - Diamond High Council (HRD, which is an abbreviation of the Dutch “Hoge Raad voor Diamant”)

 - International Gemological Institute (IGI)

 - International Confederation of Jewelry, Silverware, Diamonds, Pearls, and Stones (CIBJO)


The cut of a diamond describes the manner in which a diamond has been shaped and polished from it's beginning form as a rough stone to its final gem proportions. Cut should never be confused with the "shape" of the diamond. 

 - Round Brilliant Cut - The round brilliant is the most popular of all diamond cuts. 

 - Princess-Cut Diamond - The princess cut features a straight-sided rectangular outline with a brilliant style facet arrangement. It is a hybrid of shape and cutting style that produces more sparkle than traditional square or rectangular diamonds. Princess cuts are more popular today than any other "fancy shape" diamond.

 - Cushion-Cut - The cushion cut style is simply a diamond with rounded corners.

 - Oval Brilliant Cut - The oval is considered a “fancy” shape; the elongated design makes it appear larger than other shapes of the same carat weight. 

 - Emerald Step Cut - The emerald cut is not a brilliant cut, but is called a step cut which means it has rows of facets.

 - Pear-Cut Diamond - The modified brilliant-cut pear-shaped diamond is a combination of a round and marquise shape, with a tapered point on one end. The diamond is always worn with the narrow end pointing toward the hand of the wearer.

 - Radiant Cut - A square or rectangular shape with clipped corners combining the elegance of the emerald shape and the brilliance and sparkle of the round shape. 

 - Asscher Step Cut - The Asscher cut is a unique shape with prismatic brilliance and a rectangular-faceted pavilion in the same style as the emerald cut.

 - Marquise-Cut - The marquise cut is an elongated shape with tapering points at both ends. Its shape allows the cutter to maximize carat weight, giving the appearance of a larger-looking diamond

 - Heart Cut - The most romantic of diamond shapes, the heart cut, is a brilliant cut, basically a Pear-cut with a cleft at the top.


A carat is a form of diamond measurement that's divided into 100 points; a diamond with 50-carat points would be described as a half-carat. One carat is the equivalent of 1/5 of a gram. Of all of the 4C’s are equal, diamond prices will increase with diamond carat weight because larger diamonds are more rare and more desirable. But two diamonds that have the same carat weight can have very different price points. It’s important to remember that a diamond’s value is determined by the clarity, colour and cut, not just carat weight.


Diamond clarity is the quality of diamonds that relates to the visual appearance of internal characteristics of a diamond called inclusions, and surface defects called blemishes.  Almost every diamond will contain some blemishes, and inclusions formed during the course of its crystallization. The diamonds clarity grade refers to the visual impact of these characteristics or lack thereof, Below are grades explained. Color The "color" of a diamond refers to the presence or absence of coloration in a white diamond. The whiter the diamond is the greater its value since a colorless diamond will allow increased light to pass through it and will emit a greater sparkle. It is kind of counter-intuitive that diamonds are graded for the absence of color. In the industry, diamond color grading follows a D-Z alphabetical system. D, being colorless is the highest possible grade and Z, being light yellow is the lowest grade. Technically speaking, the “best” grades would lie within the D-F colorless range with no discernible color. Colorless diamonds cost significantly more because they are rare in nature and are highly sought after by consumers in the market. In my opinion, you shouldn’t get too hung up on color as it is purely a matter of preference and personal tastes.

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