Diamond Education

Diamond Cut

Diamond cut

Cut is an important characteristic to look for when searching a diamond, which determines the amount of sparkle given. The rule to brilliance and beauty within a diamond is to reflect their true characteristic which is expressed through the cut. Further, the value of a diamond is determined by how well the facets interact with the light. A diamond cut does not refer to the shape but also to its proportions, symmetry and polish. The size, shape and angle of each facet of a diamond is characterised as a diamond proportion. When a diamond cut with proper proportions, light is returned out of the top of the diamond. If it is cut too shallow, light leaks out of the bottom, too deep and it escapes out of the side.

There are three proportional factors that determine a diamonds cut quality, and these include:


internal and external white light reflecting on a diamond, which is the combination of light reflecting from the surface and inside the diamond.


white light reflecting into all colours of the rainbow, flashes of colour within the diamond.


amount of sparkle produced by a diamond, the deeper the cut the more sparkle or shine flashes of light and dark or sparkle when moving the diamond around (Ziba and Co recommends an ideal cut).

Additionally, in the diagram below, three common light patterns are shown which affect the diamond's brilliance, the most important of which is its ability to reflect light. As a diamond passes through a light source, tiny flashes will be visible within the stone.

Ideal cut

Ideal cut
If the cut of a diamond is perfect, light will strike each pavilion facet and reflect upwards to the crown mostly.

Deep cut

Deep cut
Light escapes or refracts from the bottom or the side of a deep cut diamond.

Shallow cut

Shallow cut
A shallow cut diamond has the light escaping from the bottom.

How Diamonds are Measured

Measured Diamond

The depth of a diamond can be determined when viewing a diamond from the side; it is the distance between the culet and the table. This is usually measured in millimetres (the third number of measurements). The depth of a diamond is calculated by dividing the depth with the width. The table of a diamond is calculated by the width of the table by the width of a diamond.

Note: When diamonds are cut they already incorporate both the depth and table. This cut should be the first element to look for when searching for the right diamond. If diamonds are equal in cut, then the depth and table can be used to refine the selection.

Diamond Cut Grading

Polish and symmetry are the two important aspects of a diamonds cut. The smoothness of diamonds facets are determined by its polish and the alignment of facets are established by the symmetry. The size, shape and angle of each facet of a diamond is characterised as a diamond proportion. When having a poor polish, the diamond appears to be dull; this may create a blurred or dull sparkle. A diamond with a poor polish often has a grain of lines running along the facets. This may make the diamond appear as if it needs constant cleaning. With a poor symmetry, it can often mislead a diamond as the light being entered escapes from the diamond.


Exceptional fire and brilliance. All light entering the diamond creates an extraordinary sparkle and shine.

Very Good

Reflects light properly that is being entered in the diamond. This cut appears to be similar to an Excellent cut, with a very high brilliance for a lower value.


Reflects majority of the light that enters the diamond, for a moderate appearance. It is at excellent value in comparison to a higher cut grade.


The light that enters the diamond escapes from the sides or bottom, this leads to less fire and brilliance. The light is lost and it noticeably less luminous.


Allows the light that enters the diamond escapes from the sides or bottom. The diamond appears to be lifeless and dull.

Expert Buying Tips

  • Diamonds with a cut grade of good or very good represent an excellent combination of beauty and value.
  • For greater brilliance, choose a diamond with a Cut grade of Very Good or Excellent for round diamonds, and Good or better in fancy shape diamonds.
  • For those on a budget, primarily concerned with size, a diamond of Fair - Good cut may be an acceptable choice, especially in fancy shapes.

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Contact us by phone at (1800449642) or email at ( In addition, Live Chat is available during most business hours.

Diamond Colour

diamond color

The colour within a diamond is determined by how much or how little colour is a diamond has. The colour is generally regarded as the second most significant characteristic of a diamond. In order to have a brilliant white diamond with sparkle, colour is the aspect that should be focused on as it can be visible to the naked eye. The Colour in a diamond ranges from completely colourless high in value (D Colour Grade) to low in value light colour grade (S-Z Colour Grade).



Completely Colourless, Rare diamond grade and highest colour grade

Colourless to the naked eye, difficult to detect by trained gemmologists.

Near colourless

G-color Near Colourless challenging to notice colour to the naked eye and diamond is at great value.
H-colorI-colorJ-color Near Colourless with an excellent value, diamond colour is noticeable at this stage and is visible to the naked eye.

Faint colour

K-colorL-colorM-colorColour is visible to the naked eye, usually a yellow detectable tint and are at great value.

Very light colour

N-colorO-colorP-colorQ-colorR-colorColour is noticeable to the naked eye which can be seen in as yellow or brown tint.

Light colour

S-Z-colorThis diamond grade has too much colour to be classified as a white diamond.

Expert Buying Tips

  • For the traditionalist, look for a colourless grade of D-F for a diamond with no visible colour under magnification
  • Looking for the best value, choose a near-colourless grade of G-J for a diamond with no visible colour by the naked eye.
  • Diamonds with more facets mirror more light, they tend to conceal colour better than other shapes.

Have A Question?

Contact us by phone at (1800449642) or email at ( In addition, Live Chat is available during most business hours.

Diamond Clarity

Diamond Clarity

The clarity of a diamond is the third most important aspect to look for when choosing a diamond, imperfections within a diamond can only be seen under professional magnification.

The Clarity of a diamond refers to the little imperfections which are known as inclusions. These numerous or significant inclusions in a diamond are tiny external and internal blemishes that determine the grade point. Inclusions and blemishes are shown throughout all diamonds; these are little birthmarks for each stone which have less brilliance because the flaws interfere with the path of light through the diamond. It is very rare to find diamonds that have no inclusions or blemishes at all as it affects the diamonds value.

Diamond size does determine how noticeable the inclusions and blemishes are within the diamond, the larger the stone the more visible it becomes. Depending on the clarity each diamond has determines whether or not it can be visible to the unaided eye.

To ensure a great selection, Ziba and Co offers diamonds with a range of clarity rating from Flawless to I3. Diamonds with clarity rating of I1 or higher hold inclusions and blemishes that are unnoticeable without particular magnifies viewers.

A diamond's clarity rating is based on the number, size, and location of internal or external uniqueness. Internal uniqueness includes crystals, clouds and feathers. While external are called blemishes. These inclusions however can't be seen by the naked eye.

F1 Clarity

Flawless with no internal or external imperfections, visible to a skilled grader under magnification.

IF Clarity Internally Flawless with no inclusions, very rare though some have surface inclusions.
VVS1-VVS2 Clarity Inclusions are very very hard to identify, unless they are looked under magnification by a trained gemmologist.
VS1-VS2 Clarity Very slightly included, inclusions are small and difficult to see with the naked eye.
SI1-SI2 Clarity Slightly included, visible to detect with the naked eye can be identified easily under magnification.
I1-I3 Clarity Inclusions are visible to the naked eye can be detected easily under magnification.

Expert Buying Tips

  • The well-liked variety is the VS1-VS2 diamond. These diamonds appear flawless to the naked eye, and are a part of the price of a truly perfect diamond.
  • The next well-liked variety is SI1, where the inclusions are usually not important to impact the look and appearance of the diamond for people.
  • The bigger the diamond, the easier imperfections are to discover; thus clarity becomes more significant.

Have A Question?

Contact us by phone at (1800449642) or email at ( In addition, Live Chat is available during most business hours.

Diamond Carat

diamond carat

The carat weight is the most important aspect in the diamonds 4cs as it is the most well-known and misunderstood. A diamond's cut impacts how large the carat weight will appear as the smaller carat weight diamonds will appear larger with higher cut grades.

The size of a diamond is determined by its weight. The weight is expressed in metric carats; one carat is equal to 0.2 grams. The word carat is often abbreviated as "CT". If a diamond weighs less than one carat then it is expressed as points (0.75pts). Once a diamond becomes larger than one carat it is then indicated as carats and decimals (1.05CT), this then becomes one carat and five points. Diamond prices increase with carat weight as larger diamonds are less common and become more desirable. However, two diamonds of equal carat weight can have dramatically different values depending on its colour, clarity and cut.

Diamond Carat Size Chart:

The price of a diamond increases exponentially with the carat weight, the actual size does not. The diamond carat size chart below illustrates how diamonds of different carat weights and shapes will appear when being viewed from the top down.

Consider these factors when looking at a diamonds carat weight:

  • Diamonds Top Diameter: It is essential to measure your diamond in millimetres, this is the 'diameter' which is the distance across the top of a diamond as this is usually how diamonds are viewed when being set into a ring.
  • Diamonds Cut Grade: Consider a diamonds cut grade when searching for the perfect diamond. When a diamond is an ideal or fine cut (graded very good or higher), the light being reflected from the top makes the diamond to appear larger than it is.

Expert Buying Tips

  • The smaller carat weight diamond may have a diameter equal to that of a heavier diamond, making it appear that same carat size when viewed from above.
  • Diamond values rise at the full- and half-carat weights. Diamonds just under these weights cost significantly less, and, because carat weight is distributed across the whole of the diamond, small size differences are almost undetectable.
  • The smaller the figure, the larger the diamond will appear.

Have A Question?

Contact us by phone at (1800 449 642) or email at In addition, Live Chat is available during most business hours.

Diamond Shape

Finding the Perfect Diamond Shape At Ziba and Co we offer immerse qualified diamond cut shapes. The prominent diamond shape that often receives enquiries tends to be the round shape, as this is the traditional collection. Our various typed of certified diamonds including GIA, IGL, IGI, HRD and AGS usually come with an ideal cut. This cut is recommended to receive the best shine. All our loose diamond range provides the 4C's; colour, clarity, cut and carat are all offered with any diamond shape.

Select any diamond shape to receive informative data

  • Diamonds Top Diameter: It is essential to measure your diamond in millimetres, this is the 'diameter' which is the distance across the top of a diamond as this is usually how diamonds are viewed when being set into a ring.
  • Diamonds Cut Grade: Consider a diamonds cut grade when searching for the perfect diamond. When a diamond is an ideal or fine cut (graded very good or higher), the light being reflected from the top makes the diamond to appear larger than it is.
























Round brilliant cut diamonds are the most commonly used diamond shape. Its brilliance can be enhanced by its cut which determines the amount of brilliance given. The brilliance and fire of a round brilliant cut diamond is shown through the use of precise mathematical cut measurements. This diamond shape can be balanced out by its cut, colour and clarity whilst still receiving the perfect diamond.

Search for Round Diamond


Princess cut diamonds is the most desirable cut. The inclusions are less visible due to its unique cut and beautiful polishing techniques. The use of colour can be seen more clearly and visibly, however this can be avoided by searching for the right diamond. A princess cut diamond is the most efficient shape as the proportions can be evenly cut to create the perfect square shape. Although this perfectly cut shape is inexpensive it still has more shine than other cut diamonds, and is the ideal cut for a superb engagement ring.

Search for Princess Diamond


This modern diamond shape is similar to an emerald cut and has a pavilion shape followed by an octagonal outline. It holds a small table with a high crown with wide rectangular step facets. This diamond provides a windmill reflection that produces bright brilliance.

Search for Asscher Diamond


An emerald cut diamond is usually rectangular is shape, though it can often be narrow this diamond cut is distinctive in countless shapes. The use of sophistication and optical appearance is shown through the slanting corners and angles which are known as facets. The facets in an emerald cut diamond create an elegant look that gives of a pavilion conception. The reflection of light travels against shades of light and dark planes, it can be imagined as a 'hall of mirror'.

Search for Emerald Diamond


This contemporary cushion styled diamond is cut into a square or a rectangular shape, with rounded corners and sides. It is often viewed as 'pillow-shaped' and has been the most popular cut in many centuries. This diamond cut has superior fire and brilliance.

Search for Cushion Diamond


This diamond shape has a similar number of facets as a round diamond. It is an exquisite choice with great brilliance and fire to ensure a beautiful sparkle. This timeless and elegant shape has an advantage of a greater look due to its elongated shape, even though it might have the same carat weight as a round brilliant cut diamond.

Search for Oval Diamond


The signature look of this diamond is the trimmed corners that give it a perfect radiant view, its shape is between a cushion and a princess cut. It can be beautifully matched with other diamonds like baguettes or round brilliant cut diamonds to create an outstanding design. This diamond cut is ideal for fancy or coloured diamonds, Due to the amount of facets included in this shape.

Search for Radiant Diamond


This elegant diamond shape can be referred to as a tear drop diamond, which resembles a drop of water. It has a single point with a rounded end. The uniqueness of this diamonds makes it attractive to the eye. An important factor that should be considered when searching for a pear shape is the symmetry, as the shine should be evenly distributed to allow efficiency. A pear shape is a perfect timeless choice that could be worn either way, it is often perceived that the point should go towards the heart of the wearer, though that is a personal preference and can be worn either way.

Search for Pear Diamond


The shape of an eye can be resembled as this elongated diamond has pointed ends and creates a dramatic look. The body of this stone creates an illusion which allows the finger to look longer than what it is, due to its prolonged view. It can appear larger than other diamonds; despite of its carat weight it has substantial fire and continuous brilliance.

Search for Marquise Diamond


The symbolic feature of this stunning diamond cut is the signature idea of love and affection. This shape is perfect for any occasion but most suitable for an anniversary or an engagement ring. To ensure a superb view, it is recommended that it is placed in a plain ring setting to allow an appealing image. This cut requires great skill and is repeatedly being popularised, when choosing this diamond it should be symmetrical and balanced to grant a distinctive stare.

Search for Heart Diamond


This enchanting unique diamond shape is different to other shapes and gives an impressive view. With rich brilliance and deep fire it is often excellent as a shoulder stone though can be worn in a singular setting.

Search for Trillion Diamond