This article gives an overview of the history of diamond cutting. For detailed descriptions of the different diamond cuts see the table below or click on the links provided in the text.
The early history of the diamond is shrouded in mystery. When the first diamonds started playing a role in the lives of humans is simply unknown. Looking at the available literature the same thing keeps popping up: accurately translating ancient texts is very difficult. Two words which often have been translated into diamond, the Hebrew יהלום (yahalom - derived from halam which means to beat) and the Greek αδάμας (adamas which means indomitable or invincible) have caused confusion. When we read the old testament we encounter several diamonds but their existence is solely based on the translation of the Hebrew yahalom. The word was used to indicate an extremely hard mineral, that is certain, but assuming that it was actually referring to diamond is a modern thought. We know that diamond is the hardest substance on earth but was it known as the hardest in biblical times too?
Greek literature indicates the same issue. The use of the word adamas, for instance by Plato, has been seen as an indication of diamonds being known to the Greeks but in fact there is zero proof that this was the case. The word adamas was probably used to describe gold, iron and perhaps even corundum.
Early gemological historians didn't have access to (translated) Sanskrit texts so one hardly ever reads anything on India's own historical sources on the use of diamonds. When diamonds became a part of our lives is unclear but where they entered is completely certain: in India.
An old Indian work, named the Arthasastra, which can be dated back to the 4th century BC gives us the first proper insight in when diamonds were first used. By then diamonds were known, traded and even taxed in India. The existence of diamond experts is mentioned together with a classification of diamond. This implies a rather thorough knowledge of the subject, something which could lead to the belief that diamonds were in use for quite some time by then.
Some of the quote above certainly sounds like diamonds are being discussed but Pliny mentions a few things which don't add up. This must indicate that he confused some other minerals with diamonds. Herbert Tillander, who has written an excellent book on the history of diamond cutting, expresses his doubts about the Romans having access to perfect crystals; the Indian suppliers would certainly have kept the better stones for the native market.
Diamonds were believed to protect the owner from all kinds of mishap and for a long time it was believed that this divine crystal would loose its powers when it was in any other state than the natural one. Cutting diamonds was as much a taboo as it was difficult in the Ancient times. Tillander suggests that diamond cutting started with removing mineral matter off the faces of freshly mined crystals, which makes perfect sense. Whether controlled cleaving was being performed is unknown. This is such a rudimentary practice that there were no technical limitations preventing the ancient people to apply it to their off-shaped diamond rough but historical or archaeological proof of any early cleaving lacks completely.
After the decline of the Roman empire diamonds disappeared from European jewelry altogether. India was the only source of diamonds until the 18th century and the supply chain to Western Europe got disturbed by the lack of Roman merchants. The spread of Christianity had already subdued the popularity of the gem. The new religion condemned the superstitious attributes which had accompanied the stones. Contrary to the European situation, the gem remained its popularity in the Indian and Islamic world and it is in historic sources from these regions where interesting historical references are to be found.
The Ratnapariska by BhuddaBhatta, an Indian text which, at least, dates back to the 6th century notes the following:
Wise men should not use a diamond with visible flaws as a gem; it can be used only for polishing of gems, and it is of little value
Since polishing other gemstones with a full crystal isn't feasible this text must have indicated the grounding up of bad quality diamonds in order to create diamond powder.
Our historical trip then takes us to the 10th century where Al-Biruni writes this:
Now why is this so interesting? First, here we have reliable historical sources telling us that 6th century Indian lapidary workers and 10th century Islamic jewelers were grinding up diamonds in order to polish other stones. What is remarkable is that somewhere else in the same text Al-Biruni dismisses a stone from being a diamond because it's crystal faces could be polished. This would imply that the polishing of diamonds with diamond dust wasn't known yet by the 10th century.
Jack Ogden, a notable jewelry historian, reports to have seen Medieval Islamic jewelry that could be dated back to the 13th century which contains simple Table Cut diamonds . These would be the oldest known cut diamonds in existence. Ogden's report coincides with historical literature. An Indian text, named the Agastimata, which unfortunately hasn't been accurately dated but is believed to be written shortly after the 13th century AD, teaches us the following:
|“||The diamond cannot be cut by means of metals and gems of other species; but it also resists polishing, the diamond can only be polished by means of other diamonds||”|
European diamond cutting would have originated in Venice, shortly after 1330. This is indeed very likely since it was only after Venetian merchants started opening up the trade routes to the East that diamonds started trickling into Europe again. Whether cutting techniques were part of this new import to Europe isn't clear but can be called plausible given the fact that both the practice of grinding poor quality diamonds to dust & the cleaving of diamonds were known with the men who were supplying the Venetians with diamonds: the Islamic merchants. Definite proof of where diamond cutting originated hasn't been found yet, it could just as easily have been a European invention which backtracked the road the diamonds traveled.
Technical limitations caused the first cutters to stick to what their rough allowed them to do. At first diamond cutting would have been nothing more than superficial polishing of the existing rough. The introduction of continuous rotary motion in craft tools in the 15th century enabled cutters to grind facets into diamonds with greater ease which expanded the possibilities. This triggered more creativity and a wider variety of cuts.
Following the Venetian re-opening of the East, the Dutch, Portuguese, Spanish and English naval explorations to all corners of the globe assured a new, and steady, influx of luxury goods into Europe. The Portuguese conquered the City of Goa in 1510, which they made the main diamond port of India. This enabled Europe's diamond supply to grow considerably. Compared to the past, better rough would have been made available now that a direct line of supply was set up. It should be noted though that diamonds weren't plentiful at all. Their status would have only risen from super rare to rare.
When, towards the end of the 15th century, the European economical center of gravity shifted from the Mediterranean to the North sea, Paris, Bruges and Antwerp rose as the main polishing centers in Europe. The cutting communities there were very small ones and they were excluded from the Guild system, making it possible for Jews to participate in the trade and fashioning of the hardest stone on earth. The Northern European states had seen an influx of Jewish people from Portugal, Spain and later France due to the Christian extremist environment in those countries which eventually resulted in the Inquisition. It was within these new communities that the diamond trade and cutting techniques developed.
The developments in the 16th century lead to a shift from a mere polishing of natural crystals to genuine 'faceting'. The Rose Cut emerged and the early table cuts received extra facets on both the crown and pavilion to form an array of new cuts. Longer rectangular stones, named Hogbacks by Tillander formed a forerunner to the Baguette Cut and were extensively used to form letters and figures. Diamonds were cut to shape to be combined into Rosettes. The most popular cuts were the Table Cut and Point Cut. Examples are found in the images that have been left to us from the 16th century, a few of which you can find in the slideshow below. When you hover your mouse pointer over the thumbnail of the image the slideshow will pause.
This extremely accurate and detailed account is of great value for us investigators of the history of diamond cutting. It teaches us that the technique of bruting, be it in a very primitive form, was known and applied by 16th century cutters. In summary, by the the 16th century the bruting, faceting and polishing had been mastered by European cutters.
There are a few physical properties of diamond you should know about to properly understand diamond cutting. The first is in addition to what you probably already know: the diamond is the hardest substance on earth and can only be cut by diamond itself. The addition to this knowledge is that a diamond has 'directional hardness'. It is harder in certain directions than it is in others. The sides of an octahedral crystal, for instance, are harder than dodecahedral planes. Note that hardness, when it is used in a gemological context, stands for the ability to withstand scratching, not its ability to withstand blows. The easiness with which a stone breaks falls under the gemological heading of 'toughness'.
The ease with which a facet can be introduced into a rough diamond depends on the orientation of that facet in regard to the crystallographic planes. Diamond dust consists of millions of particles which, when they are applied on a cutting wheel, are spread out with random crystallographic orientations. Some will be hitting the stone on which the cutter is working with their softest direction and have no impact whatsoever, some with the hardest and will slowly cause the facet to be formed. The relative ease with which a facet can be introduced depends on its orientation to the crystallographic planes of relative hardness. In some directions more particles will be effective than others. This causes some restrictions to cutters. The octahedral crystal faces, for instance, lie in planes of great relative hardness and are therefore virtually impossible to be polished. Very few particles in the diamond dust would be effective. Cutters therefore have to introduce facets on planes which differ a few degrees from the harder crystallographic planes.
The second property of diamond which greatly influences diamond cutting is that of cleavage. Of all minerals diamond scores the highest on the hardness scale but it doesn't score as high on the toughness scale. Diamond has prefect cleavage which means that its crystal structure allows extremely smooth fractures to occur when force is applied in the appropriate directions.
The introduction of cleaving diamonds in order to shape them prior to faceting and polishing is believed to have it's origins in the 16th century. Breaking up diamonds into sharp fragments to be used for engraving had been known since antiquity and an Islamic publication by Ahmad ibn Yasuf al Tifaschi from the mid 13th century mentions the perfect cleavage in diamonds but the use of cleaving in gem cutting appears to be a post medieval invention. De Boodt mentions it in his 1600 AD publication Gemmarum et lapidum historia. That this technique was probably known earlier in India can be deduced from J.B. Tavernier who wrote in 1665:
when the miners see a stone in which there is a flaw of some size, they immediately cleave it, that is to say split it, at which they are much more accomplished than we are
Rose Cuts which, over time and after some evolution, became extremely fashionable until well into the 20th century. Another example of fashioning by cleaving is the Shield Cut, which is basically half an octahedron.
In addition to the above it is worth mentioning that facets need to be placed in planes which differ a few degrees from cleavage planes in order to take a good polish. When a facet lies parallel to a cleavage plane it will not take a satisfactory polish due to microscopic flaking of the surface.
Finally a new craft was added to the repertory of cutting techniques: that of diamond sawing. This addition in cutting techniques completed all the stages in diamond cutting as we know it today: cleaving, sawing, grinding and polishing. The method, described by de Laet in his 1647 lapidary De gemmis et lapidibus: libri duo consisted of dressing a thin wire with diamond powder mixed with oil and running the wire across the stone. This extremely labor intensive method was used until well into the 19th century but of course cleaving was preferred given it's relatively easy use.
Main article: Mughal Cut
We can't speak about diamond cutting without getting into J.B. Tavernier's travel accounts which have been bundled into his Six Voyages of Jean Baptiste Tavernier in which he provides a great insight into Indian diamond fashioning of the 17th century through his illustrations and text:
The product of the Indian style of cutting has been named the Mughal Cut. The term Mughal Cut is better understood to be describing 'a diamond cut in India in the 16th, 17th or 18th century' rather than a certain shape or arrangements of facets.
Main article: Rose Cut
Main article: Brilliant Cut
A new perception of what a diamond should look like slowly emerged over the 17th century. The candlelight lit dinner parties of the Baroque era demanded a more sparkling design, something that could compliment the Rose Cut stones: brilliants.Marquise formed variations of the Brilliant design applicable to rough which favored other shapes than round or square. Famous examples of early brilliants are the Wittelsbach and the Grand Sancy. It should be noted, however, that these new gemstone cuts were still vastly outnumbered by the table and point cuts, sided by rose cuts of all shapes and sizes until well into the 18th century when Indian diamonds became more scarce and the old cuts started to be recut en masse.
Just when the Indian diamonds mines started to become exhausted the first diamonds started to be found in Brazil in an area which subsequently got named after it's crystalline riches: Diamantina. Here the first crystals were discovered in alluvial deposits around 1725 and by 1730 a steady production became a reality. Individual and independent miners were working the new deposits and their constant prospecting for new deposits caused new diamond localities to be found all over Brazil during the entire eighteenth century, boosting the world's availability of diamond rough like never before. The new deposits yielded that many stones that the prices of diamond rough dropped to only 30% of what they had been prior to the Brazilian discovery!
This price drop and increased availability caused diamonds to become less exclusive. Where they had been more or less reserved for European nobility up until halfway through the 18th century they now became available to a much larger public. The cutting industry grew, profiting from this larger demand. The Brilliant gradually took over the old cuts. The 18th and 19th centuries were the time of the Old Mine Cut stones.
The rise of a prosperous middle class in Europe and the United States over the 19th century caused an enormous increase in popularity of diamond jewelry. Due to that increase in demand diamond prices rose again when the Brazilian supply decreased towards the mid nineteenth century. The European cutting centers in London, Antwerp and Amsterdam which had seen a huge growth of their cutting houses over the first half of the 19th century, experienced problems when the Brazilian mines started to produce less and less in the 1860's.
Not surprisingly the discovery of the Eureka diamond in South Africa around New Year 1866-1867 wasn't just a 'Eureka-moment' for the 15 year old boy who found the stone but it also marked the rescue of the Dutch and Belgian diamond cutting industries.
A major event in the history of diamond cutting was the invention of the bruting machine by Henry D. Morse and Charles M. Field in the early 1870's. They established British and U.S. patents for steam-driven bruting machines in 1874 and 1876 respectively. The first electric bruting machine was invented in 1891. These inventions meant the birth of the commercial application of the first truly round brilliants.
The new technology and enormous influx of rough from South Africa caused the glory days of the cutting houses to start. Plenty of customers, a steady supply of rough and mechanized cutting machines changed the ancient craft of diamond cutting into a modern industry. The round brilliant slowly morphed into the 'ideal cut' and became the standard cut for diamonds. New cuts like the Asscher Cut (realized in 1902) catered for those who wanted something out of the ordinary. The Baguette Cut was (re)introduced in 1912. One of the more modern cuts is the Princess Cut which was developed in the sixties.
The diamond cutting industry in Antwerp and Amsterdam was mainly run by Jews and was virtually wiped out by Hitler's prosecution of the Jewish population in the German occupied territories during WWII. The industry in these two cities never recovered from this huge blow and diamond cutting centers were erected elsewhere. Israel became a major player and more recently India has stepped up as a diamond cutting nation.
These days new techniques such as virtual 3D modelling to determine the best yield from rough as well as highly accurate laser sawing are applied in order to maximize profits.