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BQ 3A News > Blog > UK > A purple diamond simply bought for over US$ 14 million – no surprise, whilst you have a look at the mysteries in the back of their chemistry
UK

A purple diamond simply bought for over US$ 14 million – no surprise, whilst you have a look at the mysteries in the back of their chemistry

June 20, 2025
A purple diamond simply bought for over US$ 14 million – no surprise, whilst you have a look at the mysteries in the back of their chemistry
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Diamonds may well be ceaselessly however that doesn’t prevent them being purchased and bought. One stone idea to have as soon as belonged to Marie Antoinette, the final queen of France, has simply bought for US$14 million (£10 million) at an public sale in New York – about thrice the asking value. Set right into a platinum ring and weighing a complete of 15.5 grams, the clue to the diamond’s strong point is in its identify: the Marie-Thérèse purple.

This 10.38 carat purple diamond has been converting arms for generations, and prior to now bought at an public sale in Geneva for an unknown quantity. Red diamonds are very uncommon and there are lots of issues that scientists nonetheless don’t learn about them.

Diamonds are usually shaped underneath intense warmth and drive deep inside the Earth’s mantle, more or less 150–200 kilometres beneath the outside. Maximum herbal diamonds crystallise over billions of years, composed virtually totally of carbon atoms organized in a tightly packed, cube-like construction.

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Colored diamonds are geological anomalies. Permutations come with purple, blue, orange, yellow, purple, inexperienced, brown and black, maximum of which may also be defined by way of impurities of their crystal lattice. Yellow diamonds include nitrogen, as an example, whilst blue ones include boron.

Red diamonds don’t seem to be led to by way of such impurities. Scientists imagine that the purple hue arises from a distortion within the diamond’s atomic lattice construction. Intense drive deep underground creates forces (referred to as shear forces) that twist and compress atomic layers, which regulate how the stone displays mild.

It’s this “plastic deformation” which ends up in the purple shade, decreasing the fairway mild within the visual spectrum in order that it shifts the full color that we see in opposition to purple.

Just a small fraction of diamonds go through such excessive and actual drive and temperature prerequisites all the way through their formation. Those elements cause them to very tough to be created or even more difficult to are expecting the place they’ll be shaped. In consequence, purple diamonds are the rarest of all colored diamonds excluding purple ones, which can be shaped by way of an much more intense model of the similar procedure.

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For many years, the Argyle mine in western Australia used to be the arena’s number one supply of purple diamonds (and likewise purple ones), generating over 90% of the worldwide provide. The mine is situated at a novel geological house by way of a so-called lamproite volcanic pipe, versus the extra not unusual kimberlite pipes discovered at maximum different diamond mines. With out getting an excessive amount of into the technicalities, lamproite pipes have a tendency to be much less explosive and feature extra atypical minerals like leucite and wealthy potassium.

The Argyle mine is situated within the Kimberley area, which skilled intense tectonic process all the way through the Paleoproterozoic generation, over 1.6 billion years in the past. This supposed that the lamproite pipe used to be shaped underneath excessive pressures and temperatures.

That is believed to have led to the lattice defects within the diamonds that have been driven to the Earth’s floor, which can be liable for their purple and purple colors. The deep mantle depths within the mine have been additionally the most important, since this interprets into upper interior pressures and temperatures.

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Even so, lower than 0.1% of the diamonds extracted from Argyle have been labeled as purple (and most effective 0.00000002% have been purple, if you happen to calculate the share of purple carats discovered). The mine then closed in 2020 after 37 years of manufacturing as a result of its reserves have been exhausted, making purple diamonds much more scarce and treasured.

The Argyle mine in western Australia

The Argyle mine in western Australia, house of many of the international’s purple and purple diamonds.
Rebecca Hallsmith/Alamy

Different recognized assets come with Brazil, India, Russia and South Africa, however those mines yield purple diamonds a long way much less continuously. The rarity of high quality purple diamonds has made them extremely sought-after by way of creditors and traders alike, as demonstrated by way of the excessive sale value of the Marie-Thérèse purple. That diamond used to be in fact pink-purple, with the red hue led to by way of hydrogen being absorbed into the atomic construction all the way through the stone’s formation, making it rarer nonetheless.

Complicated ways involving shining infrared mild and X-rays into the stones – respectively referred to as infrared spectroscopy and high-resolution X-ray diffraction – have equipped scientists with insights into the structural adjustments that motive purple and purple diamonds.

But many questions stay unanswered, and the learn about of purple diamonds is still an energetic house of clinical investigations in mineral physics and crystallography. This has incorporated growing purple diamonds (and different colors reminiscent of blues) within the laboratory by way of replicating the herbal processes that shape them, however in a extra managed, speeded up approach.

Those lab-grown purple diamonds glance just about just like their herbal variations to the human eye, however can but be differentiated thru optical ways. One manner is infrared absorption, which detects how the diamond absorbs mild and vibrates at explicit frequencies.

Any other clue is the presence of sharp peaks within the visual mild spectrum that point out positive impurities, like hydrogen or nitrogen, which can be regularly present in herbal stones. In the similar taste as a CSI investigation, those ways give you the final phrase in whether or not a purple diamond is from a mine reminiscent of Argyle, a lab-grown purple, or a transparent herbal diamond that has been handled purple artificially.

Even after years of making improvements to the method for making purple diamonds synthetically, the mechanical distortions liable for their unique color nonetheless can’t be replicated exactly underneath laboratory prerequisites. Scientists
don’t perceive the entire atomic processes inquisitive about their colouring turning into everlasting so that you can recreate them completely.

The similar is in fact additionally true for different artificial diamonds, although they’re turning into more difficult and more difficult to stumble on because the generation improves. In brief, purple diamonds (and purple ones) stay a number of the maximum outstanding treasured stones on the earth. Until and till that adjustments, we will be able to stay anticipating them to modify arms for ridiculous quantities of cash.

TAGGED:chemistrydiamondmillionmysteriespinkSOLD
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