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Learn more about the king of all precious stones

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Excellent quality

International top certificates

Not all certificates are equal. For your security, we only have certificates from the three leading institutes, GIA, IGI and HRD, in our portfolio. These are independent international grading institutes that have an excellent reputation due to their particularly strict standards.

Once the tests have been undertaken by several experts, the authenticity and quality of the diamonds are recorded in a certificate. The certificate is your diamond’s ID card.

The renowned institutes adhere to internationally agreed upon criteria and standards.

The sign of love: Hearts & Arrows




Choice of cut

  • Brillant

  • Princess

  • Baguette

Colored diamonds

Value performance of diamonds

Diamonds as an investment

The Diamond: king of all precious stones

It is rare, it is made of resistant material, it sparkles in all directions: the diamond is derived from the Greek word "adamas" (invincible). It is not surprising that it is referred to as the king of all precious stones. And as the king, it has even more to offer: it reflects up to 100% of the incoming light and therefore has the highest refractive index of all precious stones with a value of 2.42. The diamond is one of the hardest known minerals in the world and scores 10 on the Mohs scale of mineral hardness. Diamonds are rare and very difficult to obtain because they are formed under great pressure at a high temperature of 1700°C and at a depth of 150 to 200 kilometres. Today, great efforts are needed to extract diamonds both from open-pit mines and underground mines as well as from offshore mines. Only a quarter of these natural treasures are suitable for use in jewelry. Therefore, diamonds are a precious token of love.

The 4 Cs: determining the quality of a diamond

Carat, clarity, color and cut are the so-called four Cs, used to judge the quality of diamonds. The expression carat is named after the seeds of the carob tree due to their weight (200 milligrammes) and has been used to weigh diamonds across the world since 1875. The price of a diamond depends very much on its clarity. The fewer inclusions a diamond has, such as crystalline structures or other minerals, the higher the classification and the more expensive it is.

If no inclusions are visible in the diamond under tenfold magnification, the diamond is classed as flawless and is regarded to be particularly valuable.

The color also determines the price of a diamond. Colorless diamonds are very popular and expensive, especially in the world of jewelry. However, fancy diamonds in colors like red, blue and black are also very valuable due to their rarity.

In contrast to the first three components, the cut of the diamond is influenced by the specialists. The cut as well as the proportions determine the brilliance of a diamond. Diamonds can be cut with the round brilliant cut, the square princess cut or the rectangular baguette cut, in a heart shape, oval, marquise, or pear shape.

International top certificates at acredo

You will receive a top international expertise for each diamond from 0.3ct purchased at acredo. For your security, we only use certificates from the independent, international institutes GIA, IGI and HRD. In addition to the dimensions of the diamonds, these certificates include the criteria shape, weight, color, clarity, polish, symmetry, proportion, and fluorescence. Each diamond is as unique as your love and has therefore been assessed and classified by several specialists according to different hard criteria.

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