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Guide to Buying Diamonds

All H&H diamonds are accompanied by a grading report that has been prepared by an independent laboratory. This document verifies the diamond’s characteristics to internationally recognised standards.

The 4 C’s

It is important to understand that there are significant differences in quality and price. To understand a diamond’s value, you must first evaluate it under the internationally recognised standards of the 4 C’s: cut, clarity, colour and carat.

Each of the 4 C’s is important and the most valuable diamonds will be those that possess the best of all 4 measurements.


This refers not to the overall shape of the diamond, but rather the quality of the cutting (the proportion, finish and symmetry of the external facets). The cut actually gives each diamond its unique sparkle and brilliance by allowing the maximum amount of light to enter and reflect out of the stone.


This refers to the amount and size of any natural imperfections in the diamond. These may be internal (known as inclusions) or external (known as blemishes).


Whilst diamonds appear to have no colour, they actually do possess tints of colour (as shown on the colour scale). These tints range from D (colourless) through to Z (yellow/brown).


This refers to the weight of the diamond, which is measured in carats (often abbreviated to ct). One carat can be divided into 100 points; a diamond that weighs one quarter of a carat, for example, can also be referred to as being 25 points.