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Peter Poussenier Bvba

About Diamonds

A summary of the different properties regarding Diamonds and Jewellery

To classify or describe jewelry or diamonds, we use a specific vocabulary. Our vocabulary is regularly refined and learns us more about issues that are important in choosing the right jewel or the right diamond. Do not hesitate to ask us any additional information if you are not sure or if you do not understand something completely. We will gladly inform you further.

Clarity

Diamonds are formed under extreme physical conditions and because of this, no diamond is free of imperfections. These imperfections can impede the passing of light through the diamond and therefore lessen the brightness of a stone. However, minor inclusions can be useful since they can contribute to the unique character of a diamond. Flaws are examined by experts under 10x magnification and can be divided under tzo categories: internal characteristics or inclusions and external characteristics or blemishes.

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FL - Flawless

No inclusions or blemishes are visible to a skilled grader using 10× magnification.

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IF - Internally Flawless

IF diamonds are free from internal characteristics/inclusions when examined under 10x magnification. A diamond is not disqualified from the Loupe Clean grade if internal graining is not reflective, white or coloured and does not significantly affect transparency.

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VVS1 - Very, Very Slightly Included 1

VVS1 diamonds contain minute internal characteristics/inclusions. These are extremely difficult to observe when examined under 10x magnification.

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VS2 - very Slightly Included 2

VS2 diamonds contain minor internal characteristics/inclusions which are somewhat easy to observe under 10x magnification.

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SI1 - Slightly Included 1

SI1 diamonds contain noticeable internal characteristics/inclusions which are easy to observe when examined under 10x magnification.

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I1 - Included 1

I1/P1 diamonds contain internal characteristics/inclusions which are prominent when examined under 10x magnification. They are also visible face up to the unaided eye. Under certain circumstances, internal characteristics/inclusions may also be visible face up to the unaided eye in higher grades. These diamonds can also be calleD Piqué 1.

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I2 - Included 2

I2/P2 diamonds shall contain internal characteristics/inclusions which are very prominent when examined under 10x magnification. They are also easily visible face up to the unaided eye, slightly reducing the brilliancy of the diamond. These diamonds are also called Piqué 2.

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I3 - Included 3

I3/P3 diamonds contain internal characteristics/inclusions which are extremely prominent when examined under 10x magnification. They are also very easily visible face up to the unaided eye, reducing the brilliancy of the diamond. These diamonds are can also be called Piqué 3.

Diamond Shape

A diamond can take on many different shapes. The most common and popular form is undoubtedly the round cut brilliant. Additionally there are various fancy shapes: the marquise (or navette), the pear, the oval, the emerald, the princess (square) and the heart shape.

The invention of modern diamond polishing is generally contributed to the Flemish jeweller, Lodewyk van Berquem (Bruges), who lived in the 15th century. Van Berken invented a polishing wheel, called the scaif, using olive oil and diamond dust. This relatively simple instrument revolutionized the diamond cutting industry. Since then, it was possible to symmetrically polish the facets of a diamond and in angles that maximized scintillation.

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Round Brilliant

The modern brilliant cut diamond is without a shadow of a doubt the most popular shape available. It consists of 58 facets and the shape is optimized to reflected the light entering the stone through the top (table). The cut surfaced in the mid 17th century and counted only 17 facets in the crown. Later, a Venetian cutter called Vincent Peruzzi, improved the shape to 33 facets in the crown.

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Princess

The princess cut is the second most popular diamond cut (the brilliant cut being the most popular). This cut, also referred to as a square modified brilliant, is relatively new. Unlike most square or oblong shapes, the facets are brilliant cut. Because of this, princess cut diamonds have more scintillation and fire than traditional step cut stones.

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Oval

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Pear

The pear is a brilliant-cut diamond in the shape of a teardrop: a single point and rounded end. It’s a popular choice for a variety of jewellery, most notably pendants and earrings. By choosing an elongated pear shape, the lenght of the fingers is accentuated. For a traditional pear-shaped diamond, the length-to-width ratio should be around 1.5:1.

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Baguette

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Emerald

The emerald cut, also referred to as step cut or table cut, is a basic/fundamental cut (like the brilliant cut). Unlike the facets in the brilliant cut, the facets of the emerald are cut in steps: stripe-like facets, which run parallel to the girdle. The corners are truncated, this is done to protect the stone. Sharp edges and points are vurnerable and risk getting chipped. The emerald cut is often used in colored stones because light is better reflected and color is intensified.

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Cushion

Cushion cuts were at the height of their popularity during most of the nineteenth century. The basis for the cushion-cut is the Old Mine Cut, a square cut with rounded corners, a high crown, smallish table and large facets. The modern cushion cut has a square shape consisting of 64 facets which are placed in an angle to maximize depth of the gemstone (note the difference with the modern brilliant cut, which maximizes the reflection of light towards the eye).

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Marquise

The particular cut of a stone is mostly a pragmatic choice. The shape of the uncut, rough diamond gives the first indication of the most efficient cut/shape. Cutting a round stone out of an oblong rough diamond, would we very wastefull. A suitable shape for this situation is the marquise. Having roughly the same amount of facets as the brilliant cut, the marquise is more difficult to cut because of the fragile, sharp points.

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Heart

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Triangle

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Cabochons

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Radiant

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Square Step-Cut

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Asscher

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Tapered Baguette

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Drop

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Rose

Briolette

Cut

The exceptional brilliance and visual appeal of diamonds is, above all, the result of the cut: the relationship between the various components of a stone (the dimensions of and the angles between the facets), the symmetry of a stone and its polish. Cut should not be confused with the shape of a diamond (the silhouette seen from the top).

3 x Excellent

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Excellent

Tablesize between 54 and 62%, Crown height between 12 and 16%, Pavilion depth between 43 and 44.5%

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Very Good

Tablesize between 52 and 53% or between 63 and 66%, Crown height between 11 and 11.5% or between 16.5 and 18%, Pavilion depth between 41.5 and 42.5% or 45%

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Good

Tablesize between 50 and 51% and between 67 and 70%, Crown height between 9% and 10.5% or between 18.5 and 19.5%, Pavilion depth between 40 and 41% and between 45.5 and 46.5%

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Fair

Tablesize up to 49% and upward of 71%, Crown height up to 8.5% and upward of 20%, Pavilion depth up to 39.5% and upward of 47%

Poor

A poor cut grade is assigned when either polish or
symmetry is poor.

Setting

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Solitaire

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Consecutive

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Pavé

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Halo

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With Side Stones

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Three-Stone

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Two-Stone

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Other

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Invisible

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Without Setting

Setting Details

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2-prong setting

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3-prong setting

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4-prong setting

Can be Classic-, Cathedral-, Contour-, Knife Edge-, Trellis- setting

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6-prong setting

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8-prong setting

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Bezel Setting

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Block setting

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donut setting

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channel setting

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other setting

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pavé ZigZag

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pavé in line

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Prongsetting

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Pavé Castel Setting

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tension setting

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American setting

Fancy Colour

Fancy diamonds are valued using different criteria than those used for regular diamonds. When the color is rare, the more intensely colored a diamond is, the more valuable it becomes. Another factor that affects the value of Fancy-Colored diamonds is fashion trends. For example, pink diamonds fetched higher prices after Jennifer Lopez received a pink diamond engagement ring. Extremely low grade quality has not stopped creative merchants from marketing for example Dark Brown diamonds as so-called chocolate diamonds.
Fancy-colored diamonds such as the deep blue Hope Diamond are among the most valuable and sought-after diamonds in the world.

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Yellow

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Orange

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Champagne

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Brown

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Green

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Blue

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Red

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Purple

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Grey

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Black

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Chameleon

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Cognac

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Cola