The cut – so much depends on it!

The cut is one of the four most important characteristics that are taken into consideration in the grading process – and the only one that is completely dependent on a human hand. The shine of a diamond and the quality of its cut lies exclusively in the hands of a cutter. How then should a cutter’s craft be judged? Below we’re going to explain the most important parameters of a cut and introduce some of the most recognizable and popular shapes.

Obraz przedstawia diamenty o różnorodnych kształtach.


Evaluating the quality of the cut involves a careful analysis of a stone’s proportion and its finish, including the symmetry and polishing errors. Poor proportions or symmetry may strongly and negatively influence a diamond’s refraction, which may translate into poor brilliance. It is worthwhile to learn more about the intricacies of cuts, which – as one of the 4Cs – have a tremendous influence on stones’ quality and price estimation.

PROPORTIONS – the knowledge of what proportions should a perfect diamond have to produce the highest level of fire and shine is a result of years of work by experienced cutters. Dimensions such as the contact angle of upper and lower part of the stone, height, and width of the whole stone as well as the height and width of its table and base are all components of an overall assessment of the proportions. Each cut has a different set of these parameters that need to be met in order for a cut to be considered excellent.

SYMMETRY – if symmetry is a part of classification in a certificate, it is usually prudent to choose a stone with an “excellent”, “very good” or “good” grade. The assessment of symmetry can tell you whether facets’ edges are evenly leveled relatively to each other, whether aspects at the opposite sides of a diamond are matching and if the facets of the crown and base are matching the corresponding facets in the pavilion.

FINISH – it’s a component that’s responsible for the beauty of the stone’s brilliance. Properly finished cut does not exhibit any polishing scratches and micro-irregularities. The importance of perfect proportions can be attested to by the fact that these qualities may often have more bearing on diamond’s value than weight – if the stone was cut to maximize the shine, that is.

5-level scale for grading the proportions and finish of a cut:

1. Excellent
2. Very Good
3. Good
4. Fair
5. Poor


When it comes to a diamond’s valuation, proper assessment of a cut’s quality is one of the fundamental issues. It’s important to trust a partner that can provide fully professional and reliable documentation attesting to the quality of the offered stones. Choosing Mart Diamonds, our clients can rest assured knowing that their investment is completely safe. Our diamonds are certified by GIA – the largest and most trusted institution in the industry. The individual certificate accompanying every stone contains, among other information, detailed information about the grade of a cut, its proportions, and finish. Our diamonds keep no secrets from our customers, and their price is set according to the current issue of the Rapaport price list. Contact us – we’ll be very happy to introduce you to our newest offers.