Diamond education

4C's - Cut

The cut is the most important factor in determining the beauty of the gemstone. The only man-made component. The cut is the art and craft of a cutter to make the stone sparkle.
The cut is determined by symmetry, proportion and polish.

Why is the cut the most important factor?

Two diamonds can be identical in colour, clarity and carat weight, but in the end it is the cut that determines whether one is superior to the other. The cut is the only man-made component.

The diamond only acquires its sparkling charm when it is cut. In the end, the cut defines whether and how a diamond sparkles. That's why we at GISELLE attach great importance to the cut of a diamond. We prefer brilliance to carat weight and certificate.

We accept no compromises and exceed industry standards so our diamonds stand out from other jewellers.

Three factors are decisive for the cut of a diamond:

The relationship of size and angles to other parts of the gem.

How precisely the different facets of a diamond align and intersect.

The details and placement of the facet shapes and the outer finish of the diamond.

Our jewelery experts from GISELLE are always there for you. Of course you are also welcome to visit us without obligation in our GISELLE boutique in Zurich .

Ask Giselle
Why is the diamond cut so important?

Simply put, the cut determines the quality of a diamond's sparkle. In my opinion the most important factor. A poorly cut diamond looks dull despite its high color quality and high degree of clarity.
GISELLE diamonds sparkle more! Almost all cutting shops work GIA- or Carat-oriented in order to get the maximum price out of the rough diamond.
I work with a grinder who works cut (sparkle) oriented! Her technique maximizes the sparkle of the stones.


The carat describes the weight of a diamond. Not, as many mistakenly think, the size.


Color means, among other things, the natural coloring of a diamond.


Clarity describes the number, size, type and position of natural inclusions in the diamond. Different inclusions are evaluated differently because not all are equally visible.


There is no right and no wrong here. It depends on the wearer.

Most of our customers are attracted to 1ct-2ct (optical). But there are also women who expressly prefer a large size from 3ct, or the complete opposite, women who want a small mini stone (approx. 0.05ct).

If you have no idea what your loved one wants, I recommend buying a diamond from 0.50ct to 1ct. Even on petite women, it doesn't look too big, and if the woman wants a larger look, you could do a so-called upgrading.

Diamonds are measured in carats. One carat equals 0.20 grams.

For a medium budget, we recommend color G/H and Si1 as good standard quality.

With white gold & platinum, definitely choose G. With rose gold and yellow gold, an H is also quite legitimate, since the stone takes on a certain yellow tinge due to the alloy anyway.

At Si1 you can expect an "eye-clean" diamond. The inclusions are particularly visible under a magnifying glass.
However, we do not recommend going below Si1. The inclusions can be visible to the naked eye and severely affect the sparkle.

You would like to buy an engagement ring or wedding ring with payment in installments, we would be happy to help you to fulfill your wishes.

The service is handled by a third party. Up to 15k (depending on creditworthiness) can be purchased in installments. You can find out more here.

our location in
heart of Zurich

In a prime location parallel to the world-famous Bahnhofstrasse, with a view of the lake. The family environment gives the location the ideal ambience. Our professional and cordial team will give you the best possible advice and shopping experience.

Bleicherweg 18, 8002 Zurich