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Diamond buying guide

Most people start by getting to know the 4 Cs, but it is far more complex than that to purchase a diamond that fulfills all the right needs. First and foremost it is crucial to choose a professional jeweler with an expertise in diamonds. The vast majority of jewelers do not have a specific expertise in diamonds and therefore cannot provide guidance and counselling in the same way a person educated and experienced in the diamond industry will be able to. An authorized diamond dealer and diamond grader, or even better a graduate gemologist from Gemological Institute of America (GIA), is your best bet for expert insight and guidance.

The GIA certificate: a passport that follows the diamond through life

Globally, there are several institutes who issue certificates for diamonds, but common for all of them save one (GIA), is that they are owned by entities within the diamond industry who are all interested in providing the highest certificate possible for every diamond, so that it may achieve the highest possible market value. At GIA, a non- profit organization and the world’s leading institute in classification and certifying of diamonds, it is considered a virtue to present a 100% correct and truthful certificate for every diamond. There are no outside influences that might affect the certification in any way. The problem in certifying a diamond occurs when there is a certificate produced for a diamond, which is not a 100% reflection of reality. Some institutes have a habit of upgrading diamonds to a better quality than what they actually are and as a result, you as a consumer can easily end up purchasing a diamond at above market price. Therefore, be careful what certificate you receive with your diamond jewelry.

Quality assurance of diamonds

There are a great amount of factors in play when buying a diamond. First and foremost, it is about matching the client’s budget with the best stone possible at that price. Both carat, color, clarity and cut are crucial for the value of the diamond in question. It is all about knowing your client’s specific needs and wishes. Some want the largest carat possible, being less focused on color and clarity, while others want a smaller carat with a finer quality color and clarity.


The color of a diamond is a factor when deciding whether you want a colorless/white diamond or a diamond with a slightly yellow hue. There is of course also fancy colored diamonds, but that is a different story all together. GIA’s color scale goes from “D” to “Z”, where every color is within a range. Therefore you might encounter differences in color within an “I” or “J” category and at DALBY DIAMONDS, we work exclusively with the best color of each category.


The same goes for the clarity in a diamond, where it is a large factor in the diamond’s looks how inclusions are placed in the stone. For example, if the inclusions are placed in a way that affects the diamond’s sparkle and brilliance by not letting the light straight through the stone, this will affect the beauty and especially the price of the diamond. In some cases inclusions can give a mat effect to the stone and in other cases inclusions can be placed so they will not inhibit the stone in any way. At DALBY DIAMONDS we only sell diamonds where inclusions are not visible to the unaided eye and a SI1 or SI2 clarity in many cases can be very good and also more budget friendly than for example VVS or VS clarities.


The secret of a beautiful exterior of a diamond lies in its cut, which refers to the diamond’s proportions and the quality of its abilities. There is great science in the cutting and polishing of a raw diamond coming straight from the mine. The beauty of a diamond lies in its complex relationship with light, where a perfectly cut diamond catches the light in a particular way, making it sparkle and radiate. The cut of a diamond also refers to the shape and faceting of a diamond cuts like round, emerald, princess, pear, marquise and cushion, to name a few. Diamonds can be brilliant cuts with triangular and kite shaped facets that radiates from the center, or layered cuts with long and narrow facets in parallel rows. The most common cut is a round brilliant cut, with the diamond having 57- 58 facets. At DALBY DIAMONDS, we take great care in delivering diamonds with an excellent cut, and in many cases also as “Triple Excellent”, which indicates that the diamond in question has achieved the finest status in its cut based on 3 deciding factors: Cut Grade (proportions), Polish and Symmetry.

1. Proportions/Cut grading
Too shallow and / or too deep cut diamonds will loose brilliance through the side and bottom. The result is a dull diamond with less brilliance, affecting the ultimate value in terms of quality and price! Cut grading: Excellent, Very Good, Good, Fair, Poor.

2. Polish
Finish grade or polish for ideal cut diamonds are described as following: All facets of a diamond are carefully polished to eliminate all imperfections, characteristics such as abrasions, scratches, nicks and polishing marks on the surface of the diamond to give the mirror shine and the final beauty touch. Polish grading: Excellent, Very Good, Good, Fair, Poor.

3. Symmetry
The symmetry is the precision of a finished diamond’s shape and the placement of its facets. Symmetry grading: Excellent, Very Good, Good, Fair, Poor. Triple Excellent cut When Proportions, Polish and Symmetry are graded Excellent in a diamond it is named Triple Excellent.

Carat weight

The carat weight measures the mass of a diamond. One carat is defined as 200 milligrams (0.200 g). Depending on quality, large diamonds are rarer and more valuable than smaller ones. A 1-ct. diamond weighs the same as four 0.25-ct. diamonds, but because it’s much rarer, the 1-ct. diamond would be worth many times more than the sum of the value of the 0.25-ct. diamonds.

Ethical source

Our business is rooted in knowledge, integrity and responsibility. By supporting the Kimberley Process, a joint initiative between world governments and the diamond industry, DALBY DIAMONDS is taking full responsibility in delivering conflict free diamonds to its clients. All our diamonds are exclusively selected from certified and world leading diamond trading companies. DALBY DIAMONDS can ensure the integrity of the relationships between mine and market, as well as the ethical treatment of all the workers in the supply chain. This type of careful management ensures a steady supply of ethically sourced nascent stones of the best quality.

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