Diamond Cut

The cut is what expresses the beauty of the diamond, and hence its importance. The idea behind the cutting is creating a shimmering look which emits light in all directions. The value of a diamond that was not cut properly hurts the quality of the diamond. There are actually 5 levels that measure the quality of the cut: Excellent, very good, good, fair, poor. The levels don’t measure the shape of the cut, but the way the sides of the diamond react to the light. A symmetric and quality cutting is considered art by its own.

The diamonds angles are indispensable for the desired light and shine of the diamond. The conclusion is that if we polish the diamond in the right angles, as detailed below, we will get the maximum reflect ability from the stone in the direction of the crown. In this state, there is no leakage of light through the pavilion (the angle of the diamond from the crown) and to the culet, and all the light goes in and reflects upwards.

Examples describing the issue

A high stone with high angles:

A flat stone with low angles:

An optimal stone with the correct angles:

 

 

cut

The cut is what expresses the beauty of the diamond, and hence its importance. The idea behind the cutting is creating a shimmering look which emits light in all directions. The value of a diamond that was not cut properly hurts the quality of the diamond. There are actually 5 levels that measure the quality of the cut: Excellent, very good, good, fair, poor. The levels don’t measure the shape of the cut, but the way the sides of the diamond react to the light. A symmetric and quality cutting is considered art by its own.

The diamonds angles are indispensable for the desired light and shine of the diamond. The conclusion is that if we polish the diamond in the right angles, as detailed below, we will get the maximum reflect ability from the stone in the direction of the crown. In this state, there is no leakage of light through the pavilion (the angle of the diamond from the crown) and to the culet, and all the light goes in and reflects upwards.

The quality of the work is split to two criteria:
1.Cut grade and symmetry
2.Polish

An important emphasis:To polish the diamonds into the fantasy shapes (Drop, Oval, Marquise, Princess, Etc.) we use a professional called modeler, to plan the shape of the
diamond. In the fantasy diamonds, we don’t grade the cut like we do round diamonds, and so there is a general score for fantasy diamonds that grades its proportions and symmetry.

1.Cut grade & symmetry

Five factors will affect the grade of the cut:
a. Major Symmetry– the symmetry of the structure
b. Minor Symmetry– the surfaces symmetry
c. Girdle– the state of the girdle
d. The state of the culet (the pointy end of the diamond)
e. Proportions

The sum of these five factors will set the grade of the cut, which are:
-Excellent
-Very Good
-Good
-Fair
-Poor

a.Major Symmetry

In this section, we will look for structural things, like the size of the circle of the diamond, or the model of the fantasy stones.
We will check to see if the culet is in the middle of the stone, the table is in the center of the stone, and if the level of the board and the girdle are parallel.

b.Minor Symmetry

We will check if the board has eight symmetrical and equal ribs and if the stars and the skirts up and down are symmetrical and equal.

c.Girdle

In this section, we will pay attention to the thickness of the girdle and its condition.
We will write down if the girdle is uneven, and we will write down its thickest point to its thinnest point.

We will use those abbreviations to describe the condition of the girdle:

-Very thick
-Thick
-Medium
-Thin
-Very thin

d.The state of the culet

The finish of the diamond should have a closed culet, but there are diamonds with culets polished as small as possible, to help reduce the risk of damage in case the diamond will get hit at its point.
Creating a polished surface in the culet will make the pressure spread over the larger surface, and in this reducing the risk of damage.

We will use those abbreviations to describe the condition of the culet:

None (the culet is completely closed)
Very small
Small
Medium
Large
Very large

e.Symmetry

No matter where we embed the diamond, we will be looking at it from the board’s direction, which is the face of the diamond and is the most important direction in the test of the diamond’s beauty and quality. That is why the polishing of the diamond in the correct angles and symmetries will look with better reflecting ability regarding brilliancy, fire, and scintillation:

-Brilliancy- white light that reflects back to the eye from the stone.-Fire- white light that breaks into the colors of the rainbow (blue, yellow, red, Etc.)
-Scintillation- white light that reflects as the result of moving the source of the light or the stone.

The quality of the symmetry will be graded this way-

-Excellent- perfect symmetry- perfect reflect ability.
-Very good- a very good level of symmetry- very good reflect ability.
-Good- a good level of symmetry- good reflect ability.
-Fair- Symmetry level with large deviation between the angles- fair reflect ability.
-Poor- Symmetry level with very large deviation between the angles – poor reflect ability.

2.The quality of the polishing

Every diamond goes through polishing eventually.
Multiple scratches and abrasions or burned surfaces indicate a poor level of polishing.

The quality of the polishing is graded this way:
Excellent
Very good
Good
Fair
Poor

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