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All About Diamonds

All you need to know about
diamonds before deciding
which to buy.

The 4Cs -
An Introduction


The 4Cs – cut, colour, clarity and carat weight – are criteria used to describe the quality of a polished diamond, and therefore determine its value. Each has precise definitions, as determined by the Gemological Institute of America (GIA), the premier organization for the grading of diamonds.

When valuing a diamond, any of the 4Cs may dominate, as each diamond is unique. Value derives from rarity, so if a diamond is colourless, colour may be a value-determining criterion when it is compared to a diamond with a slight yellow or brown tint.

Carat

Carat is a measure of a diamond's weight and an indication of its size.

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Cut

The cut grade indicates how much a diamond will sparkle.

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Clarity

Clarity is a measure of natural imperfections found within a diamond.

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Colour

Colour refers to a diamond's lack of colour, grading the whiteness of a diamond.

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What is Carat Weight?

Carat is a measure of a diamond's weight and an indication of its size.


Like many precious products, a diamond's weight and its value are related. The unit of weight for diamonds is the metric carat, which is one-fifth of a gram, and is divided into 100 points. There is a high degree of precision when weighing diamonds, as they are weighed to a thousandth of a carat rounded to the nearest hundred. A slight change in weight could result in a disproportionate change in value. This is primarily due to the existence of other characteristics such as clarity, cut and colour and how they combine to give the diamond its rarity – and therefore value.
.25 Ct.

.50 Ct.

.75 Ct.

1 Ct.

1.50 Ct.

1.75 Ct.

2 Ct.

2.25 Ct.


A carat is one-fifth of a gram, and is divided into 100 points.

What is Cut?

The cut grade indicates how much a diamond will sparkle.


Diamonds are considered exquisite because of their breathtaking play on light, which is dependent on three key attributes: brilliance, fire and scintillation.

BRILLIANCE
Caused by the reflection of white light on the diamond's surface and its insides.

FIRE
Denotes the flashes of colour visible in a polished diamond.
SCINTILLATION
Denotes the flashes of light visible when the diamond or the viewer moves.

A diamond consists of three parts from the top to bottom: the crown, girdle and pavilion. Usually, the crown and the pavilion have facets – small, polished surfaces. Some diamonds may also have a culet, a facet at the bottom of the pavilion.
Cut Grades:
EXCELLENT, VERY GOOD
GOOD, FAIR
Cut Grades:
POOR
Smaller diamond
More sparkle
Perfect polish
Visibly larger diamond
Slightly less sparkle
Very good polish

What is Clarity?

Clarity is a measure of natural imperfections found within a diamond.


Clarity denotes the presence or absence of certain internal characteristics called inclusions and external anomalies called blemishes (usually scratches and nicks on the surface of a diamond).

Clarity is probably one of the most misconstrued criteria, as it is popularly assumed to have a negative impact on valuation. In fact, measures of clarity can help distinguish real diamonds from artificial ones.
Normally, inclusions have more of an impact on a stone's beauty and value than blemishes, as in most circumstances, blemishes are relatively easy to remove. Inclusions close to the surface can be removed, but their removal reduces the diamond's weight. On the other hand, removing a blemish by recutting or repolishing the diamond normally increases its value. Any loss of weight is usually offset by the enhanced clarity of the diamond.

What is Colour?

Colour refers to a diamond's lack of colour, grading the whiteness of a diamond.


White or colourless diamonds are graded according to subtle variations in colour denoted by slight brown or yellow tinges.

The GIA uses a scale from D to Z to grade white diamonds. Small variations on this scale may have a disproportionate influence on value. Hattons carries grades from D to J, which are considered near-colourless.
Fancy coloured diamonds are typically yellow, pink, blue, green, purple or red, the last three of which are extremely rare and very valuable. The purer the colour (deep or vivid), the higher the value. When combined with size, colour may significantly impact the value of the diamond; the larger the diamond, the more prominent the colour.
Colourless
D E F
Near-Colourless
G H I J
Faint Yellow
K L

GIA CERTIFIED,
ETHICALLY SOURCED

All Hattons diamonds are GIA certified and are sourced from partners who comply with the Kimberley Process.

TRANSPARENT
PRICING

Hattons diamond prices are quoted with reference to leading industry retail pricing benchmarks as part of our commitment to bringing transparency to diamond pricing.