Category Archives: Tourmaline

Colours, names and nicknames

In order to understand this variety of colour, you will have to brush up your knowledge of gemmology a little: tourmalines are mixed crystals of aluminium boron silicate with a complex and changing composition. The mineral group is a fairly complex one. Even slight changes in the composition cause completely different colours. Crystals of only a single colour are fairly rare; indeed the same crystal will often display various colours and various nuances of those colours. And the trademark of this gemstone is not only its great wealth of colour, but also its marked dichroism. Depending on the angle from which you look at it, the colour may be different or more or less intense. It is always at its most intense when viewed looking toward the main axis, a fact to which the cutter must pay great attention when lining up the cut. This gemstone has excellent wearing qualities and is easy to look after, for all tourmalines have a good hardness of 7 to 7.5 on the Mohs scale. So the tourmaline is an interesting gemstone in many ways.

TIn the trade, the individual colour variants have their own names. For example, a tourmaline of an intense red is known as a ‘rubellite’, but only if it continues to display the same fine ruby red in artificial light as it did in daylight. If the colour changes when the light source does, the stone is called a pink or shocking pink tourmaline. In the language of the gemmologists, blue tourmalines are known as ‘indigolites’, yellowish-brown to dark brown ones as ‘dravites’ and black ones as ‘schorl’. The last mentioned, mostly used for engravings and in esotericism, is said to have special powers with which people can be protected from harmful radiation.

One particularly popular variety is the green Tourmaline, known as a ‘verdelite’ in the trade. However, if its fine emerald-like green is caused by tiny traces of chrome, it is referred to as a ‘chrome tourmaline’. The absolute highlight among the tourmalines is the ‘Paraiba tourmaline’, a gemstone of an intense blue to blue-green which was not discovered until 1987 in a mine in the Brazilian state of Paraiba. In good qualities, these gemstones are much sought-after treasures today. Since tourmalines from Malawi with a vivid yellow colour, known as ‘canary tourmalines’, came into the trade, the colour yellow, which was previously very scarce indeed, has been very well represented in the endless spectrum of colours boasted by the ‘gemstone of the rainbow’.

Yet the tourmaline has even more names: stones with two colours are known as bicoloured tourmalines, and those with more than two as multicoloured tourmalines. Slices showing a cross-section of the tourmaline crystal are also very popular because they display, in a very small area, the whole of the incomparable colour variety of this gemstone. If the centre of the slice is red and the area around it green, the stone is given the nickname ‘water melon’. On the other hand, if the crystal is almost colourless and black at the ends only, it is called a ‘Mohrenkopf’, (resembling a certain kind of cake popular in Germany).

Tourmalines are found almost all over the world. There are major deposits in Brazil, Sri Lanka and South and south-west Africa. Other finds have been made in Nigeria, Zimbabwe, Kenya, Tanzania, Mozambique, Madagascar, Pakistan and Afghanistan. Tourmalines are also found in the USA, mainly in California and Maine. Although there are plenty of gemstone deposits which contain tourmalines, good qualities and fine colours are not often discovered among them. For this reason, the price spectrum of the tourmaline is almost as broad as that of its colour.

TOURMALINE

Tourmaline
Tourmaline
Tourmaline
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Paraiba Tourmaline
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Indigo Blue Tourmaline
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Pink Tourmaline
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Rubellite
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Green Tourmaline
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Rubellite
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Rubellite

Note: custom made sizes, shapes and cuttings are available on request.

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