Selecting Your Coloured Diamond

Yellow Diamond

Pink Diamond

Blue Diamond

Finding the Perfect Diamond

Natural coloured diamonds, hard assets that possess the rare combination of beauty, uniqueness, rarity and value, are a great choice for any portfolio. When you educate yourself about natural coloured diamonds and gems, you are educating yourself on your investment and your future. An educated client makes the best decisions. There are many areas to understand before purchasing a natural coloured diamond. Subtle differences in quality can make a difference in beauty and the price, effecting your overall long term investment. It is important to deal with a professional who can provide you with honest and valuable information. At Benchmark Conversion, we will help educate and guide you to help you make the most sound decisions in your investment.

Five Tips to Help You Find the Perfect Diamond

Investment-Understand that you are purchasing a collectors item that is a mid to long term investment.

Budget-Know your budget and always purchase they best gem you can afford.

Education-Educate yourself about the 4 C’s of Cut, Colour, Clarity and Carat so that you will understand the certification of your diamond.

Intuition-Understand the benefits and drawbacks to each type of cut and gem, but still go with your instinct, you know what you like better then anyone else.

Certification-Request a report from a recognized gemological laboratory before you purchase verifying colour, clarity, size, finish, etc.

The 5 C's

The criteria when purchasing a natural coloured diamond is slightly different to colourless or white diamonds. Although the 4 C’s still pertain, cut, carat and clarity are less important. The colour is the key factor when considering a natural coloured diamond as all natural coloured diamonds are cut in a way that enhances their colour and brilliance.


Colour is the most important C when grading a natural coloured diamonds. Although there is not necessarily a desired hue, there is a list of criteria that is desired in the colour including, a uniform colour tone throughout, even hue, all over purity and sparkle.How rare the colour is also influences the value of the stone.

The 9-grade GIA colour grading scale runs as follows

Note that when a coloured diamond is graded it is viewed from the top down, as opposed to the normal grading method for colourless diamonds (which are looked at with the bottom, or pavilion up and the top, or table, down).


In coloured diamonds, the cut is incredibly important, while ensuring that as little weight as possible is removed from the raw stone during the process. Often, you will see natural coloured diamonds cut in a more unique shape then colourless stones to work around any impurities in the colour and to get the most uniform colour possible.


As much carat as possible is always tried to be saved to make the stone as large as possible. Although if some carat has to be sacrificed to get an even coloured stone, it will be done.


Impurities in clarity are tolerated in natural coloured diamonds. Although it is not desirable to have impurities that can be spotted by the naked eye, often clarity will be accepted if the colour is even and exceptional.


There is a 5th “C” that BCI calls certification. When purchasing a natural coloured diamond it is imperative that it is accompanied by indisputable proof as to the origin of its colour. Benchmark Conversion is proud to use the services of GIA, (Gemological Institute of America), a widely regarded, world-renowned laboratory unsurpassed in its coloured diamond business acumen and integrity. The 5th “C”, certification, our client’s guarantee of authenticity.