A diamond is an investment. The clue to buying a diamond is to understand the Four Cs and buy the best you can afford.

All diamonds used by Lewis Malka London have been purchased from legitimate sources not involved in funding conflict and in compliance with UN resolutions. Our diamond sources guarantee that all diamonds supplied are conflict free, based on personal knowledge and/or written guarantees provided by the suppliers of these diamonds.

Selecting a diamond ring is a moment filled with meaning and anticipation.

At the heart of this choice lie the Four Cs: Cut, Clarity, Colour & Carat. These are the hallmarks that shape a diamond’s brilliance, beauty, and rarity.

By understanding them, you’ll be able to choose a stone that not only reflects exceptional craftsmanship but also captures the essence of your love story.

Cut

– the spark of life

The cut of a diamond is what brings it to life. More than shape, it’s the precision of its angles, symmetry, and polish that allow light to dance through the stone. A perfectly cut diamond releases an unrivalled brilliance — the fire, sparkle, and scintillation that make hearts skip a beat.

At Lewis Malka London, only diamonds graded ‘Very Good’ or ‘Excellent’ in cut are chosen, ensuring that every stone radiates with exceptional beauty.

Clarity

– nature’s signature

Every diamond carries subtle traces of its natural journey, known as inclusions. Clarity reflects how visible these are and how pure the diamond appears to the eye.

VS (Very Slightly Included) and SI1 offer a refined balance, where inclusions are barely perceptible without magnification.

The higher the clarity grade, the rarer and more pristine the stone becomes, with flawless diamonds treasured as nature’s masterpieces. True luxury is often found in a diamond that appears utterly clean to the naked eye, allowing its brilliance to shine uninterrupted.

Colour

– the purity of light

In diamonds, colour is measured not by vivid hues, but by the absence of them. The finest diamonds are icy white, reflecting light with unmatched purity.

D–F: Perfectly colourless, luminous and rare.

G–H: Near-colourless, offering superb beauty and value, appearing brilliantly white once set.

I–J: A hint of warmth, which can glow beautifully in yellow or rose gold settings.

Choosing the right colour grade ensures your diamond complements both the setting and your personal style, whether your taste leans towards classic elegance or contemporary warmth.

Carat

– a measure of presence

Carat weight defines the size of a diamond, but true presence is about more than numbers. A diamond of perfect proportions will appear larger and more captivating than one that is simply heavy.

0.50–0.75ct: Refined elegance, perfect for everyday grace.
1.00ct: The timeless benchmark — iconic and celebrated.
1.50ct+: A statement of grandeur, reserved for those seeking something truly rare.

Sometimes the most discerning choice is selecting a diamond just shy of a milestone weight, offering remarkable presence with exceptional value.

THE FOUR Cs

Cut+–

In my opinion the cut is probably the most crucial of the Four Cs to understand. The brilliance of a diamond depends heavily on its cut. Here at Lewis Malka London I make sure we use only the better grades of diamond cut. This would be either classed as excellent or very good. This is to guarantee that your jewellery is as beautiful and sparkly as possible. My guide shows you how to choose a diamond with the best cut. You don’t want a stone that’s either to shallow or to deep. You need to ensure the proportions are well balanced thus getting maximum refraction from your diamond.

Clarity+–

All diamonds will have some sort of inclusion within, it’s all part of the process that the carbon undergoes during those many years of pressure and high temperatures. The visibility, number and size of these inclusions establish the clarity of a diamond. Diamonds that are clear create more brilliance. The clearer the diamond, the rarer the diamond and the more expensive it is. I would say that most people will have inclusions in their diamond, however it’s the size of the inclusions which matter. I believe a diamond which is graded as “vs” shouldn’t have any illusions which the naked eye can see. I recommend either a VS2 or SI1 as a starting point for a good “eye clean” clarity.

Colour+–

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Carat+–

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