Determining a Diamond’s Quality

Determining the rarity, and therefore the value of a diamond has been done by professional jewellers in the same manner for many years now; and it is because of this systematic approach that they can be easily compared to distinguish high-quality diamonds from others. The method used is commonly referred to as the four-Cs, and is done by observing the stone’s clarity, colour, cut and carat. But what are these differing factors, and how can they be used to gauge the value of a diamond? Find out more below!


Natural imperfections are a part of many diamonds, these blemishes often come in the form of internal features and surface irregularities called blemishes and inclusions respectively. It is the absence of these irregularities that give a diamond its clarity; and the more clarity a diamond has, the higher its value will be.


Colour also plays a vital role in the value of a diamond, and even the slightest tints can make the difference. Generally speaking, the more colourless the diamond is, the more value it will have per carat. They come in a range of colours, with light-yellow and brown being the most common. But it’s those that have little-to-no colour at all that are the most coveted. To grade the colour level of stones accurately, jewellers generally compare them to masterstones, which are diamonds which have been colour graded under controlled conditions.


The cut of a diamond has a direct effect on how it interacts with lights, making it more or less refractive. Because of this, a diamond with better proportions and a good polish make it interact more favourably with light, and can thus be taken as a mark of good craftsmanship. And so the better the cut, the more it works with light, the more valuable the diamond.


As with many things in life, the cost of a diamond is largely determined by its weight. The industry standard for weighing a diamond is the metric carat, which translates to 0.2 of a gram. Carats are further divided into points, 100 of which make up a carat. When diamonds are weighed they are done so to a thousandth of a carat, and are rounded up to the nearest hundredth (point).

Contact Romanelli Designs

With these four pointers in mind, you should have an easier time separating the more valuable diamonds from those of less value. To find out more about having custom made, or custom designed jewellery crafted specifically for you, contact a representative

By |September 18th, 2018|Categories: process-timeline|0 Comments