The 4 C’s of Diamonds

This section is aimed to assist our clients in understanding exactly what to look for when considering purchasing a engagement ring at London Wedding Ring Company.

If this is your first experience or you already have some understanding of diamonds, our main intention is to ensure it is a delightful and helpful process.

When considering a purchasing diamond, it is important to be aware of the ‘4’C’s’ in determining its value. Colour, Clarity, Carat and Cut. We believe at London Wedding Ring Co that every purchase has undergone this process ensuring pour clients get the perfect diamond for them.

At London Wedding Ring Co we aim to support our customers with highly qualified diamond consultants in making decisions with purchases. All our diamonds are either certificated or non-certified but are all supplied by ethical and legitimate sellers.


Colour grades are determined using a GIA colour scale D (Colourless) to Z (Brown).

Each letter grade represents a range of colour the higher the colour (D) the higher the value of the diamond as it is more desirable.


Diamond clarity refers to the absence of these inclusions and blemishes. Diamonds without these birthmarks are rare, and rarity affects a diamond’s value.

The GIA clarity scale starts with IF (Internally Flawless) and ends with I3 (Included). Diamonds form under immense pressure, therefore it is exceptionally rare to find a diamond that lacks any internal and external characteristics.

These characteristics are a result of a diamonds structure and help gemologists differentiate between natural, treated and synthetic diamonds.


Diamond carat weight is the measurement of how much a diamond weighs. A metric “carat” is defined as 200 milligrams. Each carat can be subdivided into 100 ‘points.’ This allows very precise measurements to the hundredth decimal place. A jeweller may describe the weight of a diamond below one carat by its ‘points’ alone.

  • ½ CT = 50 POINTS
  • ¾ CT = 75 POINTS


Diamond cut refers not to a diamond’s shape (e.g. round, oval, pear, etc.) but to a diamond’s proportions, symmetry and polish. The beauty of a diamond depends more on cut than any other factor.

GIA cut scale ranges from Excellent to Poor. GIA provides a cut quality grade for Round Brilliant cut diamonds that fall in the GIA D-Z colour range.

Diamond Shapes

A diamond’s shape refers to the general silhouette of the stone and is not to be confused with cut, or the stone’s facet arrangement.

Why choose London Wedding Ring Company?

We have a passion for diamonds, wedding and engagement ring jewellery and explore the international diamond market to source the most desirable stones for our clientele.

All our diamonds and jewellery are sold at TRADE PRICES to ensure all our customers are getting exceptional value for their money. Furthermore, we will always try to do our upmost to price match or be more competitive than other jewellers. All our diamonds, gemstones and fine jewellery are ethically sourced and are purchased from legitimate sellers.

Our Gem-A trained diamond buying and grading team are on hand to assist you in with any enquires or purchase decisions you may have, ensuring you have an informative yet pleasurable experience.

All wedding rings, engagement rings and any other fine jewellery purchased from London Wedding Ring Company comes with a complimentary detailed and photographic Insurance Valuation.

We also offer customers a loyalty scheme discount when purchasing any wedding bands if you bought an engagement ring from London Wedding Ring Company.