Brush and colour are next to weight and cleanness for other diamond assessment criteria. Diamonds are most often cut with a diamond cut, which is what makes diamond jewellery so bright and mesmerising. The colour of diamonds is most often white or yellow, but there are diamonds of other colours, so called "fancy diamonds".
Brush is a very important modification and parameter of the diamond. The raw stone does not look dazzling - it reminds one more of a piece of glass.
Diamonds are manipulated into many shapes: awning, baguette, heart, teardrop, oval and emerald brush. Between the cuts, however, the dominant position is a round diamond with eight-dimensional symmetry.
KLENOTA uses the brilliant cut the most. The second most common is the princess cut.
The brilliant cut is the most popular cut of diamond; it has been manufactured for the longest time and has the most intense production. It has at least 57 polished faces, the so-called "facets": 33 on the top (crown) and 24 on the bottom (pavilion). Inside the diamond is a thin, unpolished strip. The light that passes through the facets is reflected by this shape in the best way for maximum intensity. This is what makes jewellery with diamonds so brilliant and sparkling.
The princess is a relatively new type of cut and is nowadays very popular, especially for engagement and wedding rings. It has a high number of faces, usually 81, when it is processed, and it takes maximum advantage of the natural shape of the stone and loses its weight.
Parameters of the cut rating
Brilliance (evaluates the amount of reflected white light from the cut stone)
Fire (expresses the spectral colors in which the light emerges from the ground stone)
Spark (means the degree of color play when moving a stone or moving the observer's head)
Grades of grain
The quality of the diamond blade is generally assessed:
Proportion - angles and percentage ratios of individual parts of the cut
The best-cut stone has a perfect harmony between brilliance, fire and sparkle. The most sophisticated type of cut is still a brilliant cut with 57 faces that are trimmed to precisely defined proportions.
Surface treatment - the quality of the polished surface of the face (whether it is perfectly polished, it does not contain marks from grinding, etc.)
The most common defects that occur are scratches, lines after grinding, recesses and dents, abrasion on the edges of the face, traces of grinding (surface oxidation), natural and redundant faces.
Sharp Symmetry - Evaluates whether all faces are the same size and cut at the same angles, whether the table and the calf are exactly in the center,
The diamonds are divided into five degrees according to the quality of the cut:
Excellent - I / E
Cutting-edge diamonds of the highest quality - roughly three percent of total production. It reflects almost all the light that comes to the diamond.
Very Good (Very Good) - VG
They represent about 15% of the finest diamonds. They reflect almost the same volume of light as Ideal / Excellent diamonds are almost indistinguishable to the naked eye.
Good (Good) - G
About a quarter of diamond production falls into this category. They reflect most of the light.
Medium (F) - F
They are still well-cut diamonds, but they shine less than diamonds of higher categories.
Bad (Poor) - P
These diamonds do not meet the demands for high-quality grinding. Most of the light that falls on a diamond is lost, causing the stone to lose its glitter.
The diamond is the only precious stone that occurs in nature in almost every colour modification. The most common are colours ranging from white to yellow. These colors are included in the international diamond color scale, which is labeled with the Latin alphabet D-Z.
The color specification is done by experts using a set of sample stones to which the diamond is compared.
Fancy diamonds are colourful diamonds; most often we encounter red, pink, blue, yellow, orange, green and brown. Yellow is the most common colour; pink, red, blue and green diamonds are very rare.
The color saturation levels according to GIA's fantasy diamonds are as follows: Weak, Very Light, Light, Effective Light, Fancy Intense, Fancy Deep, Fancy Dark.
Gia.edu. (2016). Diamond Quality Factors. [online] Available at: http://www.gia.edu/diamond-quality-factor [Accessed 6 Dec. 2016].