Diamonds are said to have many things, even magical powers. But they are definitely one: the oldest asset in the world. No stone is younger than 900 million years, since then no diamonds have arisen.
Great pressure and enormous heat were needed to turn carbon into diamonds deep in the earth. By erosion, they came closer to the surface in the course of millions of years. So every diamond is a glittering testimony to the history of our planet. And thus not only the oldest, but also the most beautiful asset in the world.
Another superlative: diamonds are the hardest mineral on earth. A diamond can only be cut with another diamond. The cut, in turn, makes up the fascination – the stone breaks the incoming light. One of the reasons for this legendary sparkle, the diamond fire, is the high density inside.
It reduces the speed of light by half. No wonder, then, that even centuries before our era, diamonds were considered extremely valuable. The oldest price lists are from India. Nevertheless, compared to the diamond itself, the trade is downright young.
– Purchase of property at special conditions
– Specialized wholesaler of diamonds
2. Bearing Arrangements
Retention of all values in the bonded warehouse Switzerland
Certification by GIA diamond testing laboratories Antwerp Belgium
Monitoring by renowned Swiss accountants Switzerland
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A diamond has a very high refraction and a strong shine, coupled with a striking dispersion, which is why it is mainly used as a gem today. Its brilliance is based on countless internal light reflections, which are caused by the careful polishing of the individual facets, which must be in specially selected angular relationships to each other. The goal is to let a high percentage of the incident light escape from the stone through reflections in the interior of the stone towards the viewer. In the meantime, grinding and its effect on computers are simulated and the stones are ground on machines in order to achieve optimum results through exact execution. Only a quarter of all diamonds are qualitatively suitable as gemstone.
Of these, only a small fraction meets the criteria that are currently set for gemstones: Sufficient size, suitable shape, high purity, freedom from defects, quality of cut, brilliance, color dispersion, hardness, rarity and color or colorlessness as desired. In the early Middle Ages, the diamond had no special value due to the lack of processing options, and mostly only the colored stones were called gemstones. Probably in the 14th century and until the 16th century, diamonds with a smooth cleavage surface were ground down and up in domed faceted form. This cut was called Rosenschliff, later variations with several facet levels the “Antwerp Rose”. These diamonds were then picked to increase reflection in silver over a foiled well which was polished and sometimes also had impressions of the facets of the rose cut.
With the invention of better grinding wheels in the 17th century, it was possible to grind diamonds with a pointed lower part, which for the first time could reflect back to the observer by total reflection from above. Such diamonds were then taken open at the bottom and many diamond roses should then have been re-ground. This cut form showed, like the diamond roses below, a good brilliance and the fire (dispersion) of the diamond. Until the 19th century, the processing consisted of only two techniques, the splitting along the cleavage planes (octahedral surfaces) and the grinding / polishing. The invention of sawing has enabled the development of diamonds with a modern finish and less processing loss. The modern cut was created in the 20th century, with a significantly higher light output, which pushes the fire (dispersion) in the background. Since the 1980s, diamonds have been processed with lasers to remove dark inclusions and mark stones. The intrinsic color of diamond is not as easy to influence as other gemstones. Unsightly stones are used for color change since the 1960s in nuclear reactors for irradiation. The result is permanent color changes. Dirty gray, white and yellowish stones get a glowing blue or green. This may be followed by a heat treatment, wherein the crystal changes generated by radiation “heal” in part again and become visible as a further color change. The results are not always clearly predictable.