Famous StonesNews

The Incomparable Diamond

By 13.03 September 20th, 2018 No Comments

In 1984 a young girl was playing outside her uncle’s house in a small town, Mbuji Mayi in Zaire, now known as the Democratic Republic of Congo. The rubble dump in which she was playing was close to the MIBA Diamond Mine and amongst the rubble she found a diamond which weighed 890 carats, about 178 grams, the largest brown diamond belonging to the rare yellow diamond family, and the fourth largest rough diamond ever found.

The girl’s uncle sold the stone to local African diamond dealers, who then sold it to Lebanese diamond dealers, who in turn sold it to De Beers. De Beers sold it to Zale Jewellers and this diamond was co-owned by Donald Zale, Louis Glick and Marvin Samuels, who led the team in the cutting of the stone.

After several years of analysis this magnificent stone was cut into one large diamond and 14 smaller diamonds.  The cutting of this irregular shaped stone, thick at one end, narrow at the other, sunken and pitted on one side and ridged on the other, required Samuels’ superior cutting techniques, which resulted in a stone that is virtually free of inclusions.

The large stone is known as the Incomparable Diamond and weighs 407.78 carats (81.5 grams). It is the third largest polished diamond in the world and the largest Internally Flawless diamond.

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The Incomparable Diamond with some of its 14 satellite
stones

It was graded by the Gemological Institute of America as Shield Step Cut (trilliant), Fancy Deep Brownish Yellow Diamond, Internally Flawless. The other 14 polished diamonds are in a range of colours – from almost colourless
to yellow brown.

The whereabouts of this diamond are unknown. On auction in 1998, with a reserve price of $20 million, it was not sold. On eBay in the early 2000s it was again not sold, despite the price being reduced to $15 million.

The Incomparable Diamond is one of the world’s enigmas and it is still thought to be in the possession of Messrs Glick, Zale and Samuels!

 

 

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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