How To Choose Your Perfect Diamond

Sparkling, Elegant, Beautiful

Choosing Your Perfect Diamond

Diamonds come in all shapes and sizes, and there is sure to be one to suit your taste, style and budget. When choosing a diamond, there are several essential aspects to be considered, commonly known as the four Cs: colour, clarity, cut and carat.

Diamond Colour

Diamonds are graded by colour – in most cases, the more colourless the diamond, the higher its value. The exceptions to this rule are the fancy coloured diamonds, such as pinks, yellows and blues.

GIA is the industry standard for measuring diamond colour. The letter D represents the most colourless diamonds, ranging up to the letter Z for a light yellow or brown diamond.

As you can imagine, colour grades are judged under controlled lighting and precise viewing conditions.

Diamond Colour Chart
Diamond Clarity Chart

Diamond Clarity

Clarity is a measure of the flawlessness of a diamond, and the clarity rating affects the beauty and price of each stone.
Virtually all diamonds have some imperfections known as inclusions and blemishes.

The industry standard rates all gem-grade diamonds on a scale from FL for flawless, to I3 for heavily included.

A diamond is described as ‘flawless’ if no external imperfections or internal flaws are visible under 10-power magnification. Flawless diamonds are scarce – and impacts the price accordingly.

Diamond Cut

The most critical of the four Cs is the cut of your diamond, as it not only governs its shape, but also the fire, life and brilliance it displays.

Diamonds are carefully cut and polished to emphasise the stone’s brilliance. Traditional diamond shapes include Brilliant, Princess, Oval, Marquise, Pear, and Emerald.

A diamond should work as a mirror, capturing the light and reflecting it from one facet to another before sending it back to the crown of the stone.

(The middle diagram shows how the light ideally bounces around when a diamond is cut well.)

Types of cut on diamonds
Diamond Cuts
Diamond Carat Chart

Diamond Carat

The weight of a diamond is measured in carats. One carat is equivalent to 0.200 grams – but weight alone doesn’t determine the diamond’s value.

When you compare two diamonds of the same weight, the value depends on the quality of each stone.

When you compare two diamonds of equal quality, the larger stone will usually hold considerably more value. Typically, a two-carat diamond will be worth more than twice as much as a one-carat stone.

engagement ring setting-diamond expert David Law-jpg

Diamond Expert David Law

I am David Law, and I have been buying and selling diamonds since the early 1980s.

When you entrust me to select a diamond for you, I will consider the four Cs among many other factors to ensure you experience the WOW factor when you first glimpse the choice of stones he’s personally selected for you.

All my diamonds are presented with a GIA certificate, reassuring you that they meet the highest standard of reliability, consistency and integrity.

Book a FREE exploratory design consultation

On a day and time that works best for you.

Work one-on-one with me David Law and explore all your options for creating your very own bespoke jewellery piece. From my studio close to Bond Street Station. At locations across London around the M25, leafy Hertfordshire and Surrey.


We can even design together face to face from the comfort of your home with a Zoom or Skype video call.

Whether you are looking for a classic or modern piece, I can help.

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Meet David Law

Bespoke jewellery designer since 1985