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The Top 6 Rarest Fancy Couloured Diamonds

By 11.01 September 20th, 2018 No Comments

When it comes to diamonds in general rarity equals value. With normal diamonds the value is based on the absence of colour with colourless diamonds being the rarest. On the other hand, we get fancy coloured diamond’s where the saturation of the colour is the most significant characteristic and adds to the rarity of the diamond. In fact, unlike a colourless diamond where the 4C’s “carat weight, clarity, colour, and cut,” are all equally important to the overall value, the fancy coloured diamonds colour characteristic plays the most important role in the value of the diamond.

Yellow Diamonds
Yellow diamonds are of the most common among the coloured diamonds and are less costly. There is a rather high demand for yellow diamonds which is closely followed by the pink diamond. Most of the time the demand of coloured diamonds fluctuates depending on which celebrity is seen wearing the diamond – I mean, who doesn’t remember Jennifer Lopez’s 6.1-carat pink Harry Winston diamond engagement ring worth a reported $1.2 million.

Green Diamonds
Second on the list is the Green Diamond. The green colour is caused by exposure to atomic radiation or radioactivity making it extremely unique. So much so, that it is somewhat difficult to determine whether a green diamond is natural or treated, which is very hard to determine. Many polishers purposely leave a section unpolished along the girdle of the stone so that diamond associations, such as the GIA, can identify the natural colour of the stone and thereof award it a certified diamond certificate.
The most famous green diamonds must be the 40.70 carat pear shaped VS1 rated Dresden Green diamond. It is the largest, and perhaps the finest, green diamond known to have a colour of natural origin and is reported as one of the largest and finest natural green diamond ever discovered.

Orange Diamonds
Third on our list of rare colours is the orange diamond of which the most famous is the Pumpkin Diamond weighing in at 5.54 carats which was bought and named by The House of Harry Winston at a price of $1.3 million dollars.
Just like yellow diamonds, orange diamonds get their colour from nitrogen. The difference is however that to produce an orange colour, the atoms must be aligned in a very precise way which lends to the rarity of the stone. So far only mines in Australia and in Africa have ever produced orange diamonds.

Pink Diamonds
Pink diamond comes up on our fourth rarest of diamond colours and arguably the most beautiful of colours. The way in which the pink diamond gets its colour is still somewhat of a mystery although scientists speculate that the stress and strain experienced by rough diamonds when they are in the Earth’s mantle causes the diamond’s lattice to be distorted. This distortion creates graining and pink colour zones to occur within the diamond. The pink diamond holds the title of the most expensive gem ever sold at auction, the fancy vivid pink diamond known as the Pink Dream or Steinmetz Pink, weighing in at 59.60 carats sold for $83 million dollars.

Blue Diamonds
Following on with the rarity of colour we have the second rarest colour, the blue diamond. The blue diamond gets its colour from the presence of boron. Boron is a chemical element produced entirely by cosmic ray spallation and it is a low-abundance element in the Solar system and in the Earth’s crust. The most famous of blue diamonds and jewellery pieces in fact is the Hope diamond. The Hope diamonds ownership dates back almost four centuries. Weighing 45.52 carats, its exceptional size has revealed new findings about the formation of gemstones.

Red Diamonds
The rarest of diamond colours is the red diamond, in fact red diamonds are so rare that there is little gemmological information about them. What is known however is that crystal lattice defects showing stress lamination during the diamond’s formation are the main cause of the red colour. While pure red diamonds are almost non-existent they do come in a purplish to brownish red colours. Combine these colours with high clarity, cut and carat and you have a near priceless diamond.

Clarity

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Color

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Carat

The international unit of weight, used for measuring diamonds and gemstones. 1 carat is equal to 200 milligrams, or 0.2 grams.

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Clarity

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Color

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Cut

Nothing is more impactful on a precious stone’s brilliance than its cut. The cut refers to the angles and proportions of a diamond. Known in the industry as ‘fire’, referring to the coloured light reflected, and ‘brilliance’ for the uncoloured light. The cut of a diamond – its form and finish, its depth and width, the uniformity of the facets – determines its beauty. The skill with which a diamond is cut determines how well it reflects and refracts light. A diamond should be cut proportionally, neither very shallow not very deep, given its dimensions. A diamond’s cut is its most important characteristics and a measure of its apparent beauty.

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Certificate

A diamond certificate or grading report provides an expert opinion on the quality of the diamond and is provided by an independent gemology lab. Trained gemologists with specialized equipment measure the weight and dimensions of the diamond and assess quality characteristics such as cut, color, and clarity. Brilliant Earth diamonds are certified by the world’s leading gem grading labs including GIA, IGI, and GCAL.

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Depth

The height of a diamond, from the culet to the table referred as a Depth of the diamond . Depth % is the height of the diamond as a percentage of the girdle diameter.

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Table

Table referred as the largest facet of a gemstone, located at the top. Table % is the table width as a percentage of the girdle diameter.

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Polish

Polish refers to the smoothness of the exterior of a diamond. Polish is graded from Ideal, Excellent, Very Good, Good, Fair, or Poor. Polish grades of Good or higher have the least effect on the brilliance of the diamond and recommended by us for the finest quality jewelry.

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Symmetry

Symmetry refers to the angles to which the facets are aligned. Basically exactness of the shape of a diamond, and the symmetrical arrangement and even placement of the facets. If facets are misaligned, the diamond may poorly reflect light. Symmetry is graded from Excellent, Very Good, Good, Fair, or Poor. We recommends diamonds with Good or higher symmetry grades.

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Fluorescence

Describes the diamond’s response to ultraviolet light. In diamonds with strong or very strong fluorescence, there may be some interference with the flow of light which causes a milky or oily appearance. Canadian diamonds almost always have none to slight fluorescence.

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Measurements

Diamonds with “fancy” shapes are measured according to their length, width and depth. These diamonds will have a longer axis (the biggest measurement) and a shorter one that represents their width. The depth indicates the measurement of the diamond from the bottom to the top. The relative proportions of a diamond ultimately affect its quality and value.

Round-shaped diamonds are never perfectly round even though they may seem to be that way when you look at them. There is a tiny variation between maximum and minimum diameter, so dimensions are reflected as measurements of maximum diameter, minimum diameter and depth.

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