• How do you determine the best colour for diamonds?
  • Is there a price difference between two diamonds which have the same carat weight and the same clarity but one has a certificate and the other on doesn’t?
  • Does a genuine diamond have blemishes and will they lessen its value?
  • Will the cut affect a diamond’s value?
  • Why is there a big difference in value between a high-colour diamond and a low-colour one?
  • What kind of cut gives the best reflection?

There is no such thing as best colour for diamonds in terms of an individual preference; however, in terms of quality and value the best colour is no colour at all because such a diamond is extremely rare and would be designated a D colour, under the GIA grading system. It is important to remember, however, that many customers actually prefer a hint of colour, or even a pronounced colour which in diamonds often means what is termed a “fancy coloured diamond”.

A certificate provides the analysis of the 4C’s from a gem testing laboratory as they relate to an individual gem. Naturally, a diamond that has a reputable certificate can be assigned a more exact value than one without.

Almost all natural diamonds contain some minute inclusions present when they were formed billions of years ago. However, some very rare diamonds are judged to be completely flawless, making them extremely valuable. The very fact that rough diamonds can be graded into 14,000 categories is an indication of the variety that nature brings to diamonds, making every single gem unique. In most cases there natural inclusions cannot be seen by naked eye. However, it is important to remember that value is a reflection of rarity so that whilst inclusions give each diamond a unique character and personality which many customers seek, the fewer the marks made by nature, the rarer and more costly the diamond becomes.

It is important to understand the difference between the cut, that is the shape of diamond, which is entirely dependently on your taste and the skill of the diamond cutter in producing the finished polished gem. The closer this is to the ideal proportions that will release the maximum brilliance, scintillation and fire of each individual gem, the more beautiful it will be. However, the value of the diamond you select regardless of shape will depend on a combinations of the 4C’s.

The rarest the most valuable diamonds in the world are those that come closet to having no colour at all other than the very rare diamonds called “fancies” such as blue, red or green, pink or intense yellow. However, colour is only one of the four criteria by which a diamond will be judged. Equally important are cut, clarity and carat weight. So the closer a diamond is to flawless and without colour the rarer and more valuable it will be.

The brilliant cut maximises the balance between life (brilliance) and fire (dispersion); because cut is a question of taste and all cuts are beautiful in their own way. Brilliant cut has a 58-facet arrangement that radiates from the centre of the stone towards the girdle, and has triangular facets.