Rio Tinto

Red diamonds, the rarest

Discovering a very rare gem: red diamonds. Did you know they exist? There are few of them and they have crazy prices. But they are beautiful ♦

Have you ever seen a natural red diamond like a ruby? It is very difficult. If only one diamond out of 10 thousand specimens has enough color to be classified as fancy (i.e. fantasy, of a color other than the classic white-colorless). Among the fancy diamonds, the pink ones are considered among the rarest and, if they have an even darker shade of tone, they are even more exceptional. These diamonds almost always also have secondary colors: pink, purple or brown, like the nuance of the Edcora Red Diamond, the largest ever classified by the Gia (5.71 carats) and kept well hidden by its owners, it seems to be a company of Hong Kong, so much so that there are no public photos and the origin of this diamond is not even known.

Due diamanti rossi della miniera australiana di Argyle
Two red diamonds from the Australian Argyle mine

In short, diamonds that have a red color are very rare. Furthermore, the origins of this coloring are still mysterious. Gemologists have not yet managed to agree on the origin of this shade. The most reliable thesis is that red diamonds are actually very dark pink gems. During the formation of the diamond, this type of stone would have been subjected to such great pressure as to alter the internal molecular structure: atoms out of place, compared to those of common colorless diamonds. But, at the moment, this hypothesis is being discussed.

Il diamante rosso De Young
The De Young Red Diamond

You will never buy a red diamond, unless you are as rich as a sheikh or a hi-tech genius from Silicon Valley. But, in case you are offered one, be careful: the color red may (and is the most likely hypothesis) not entirely natural. In fact, the coloring can also be induced by subjecting a normal colorless diamond to radioactive particles, heating it to high temperatures and then putting it under strong pressure. In short, it is no longer a natural color.

Diamante Argyle Everglow, 2.11 carati, radiant shaped, Fancy Red diamond
Diamante Argyle Everglow, 2.11 carati, radiant shaped, Fancy Red diamond, Rio Tinto

The value of the Brazilian diamond Moussaieff Red Diamond, of 5.11 carats with a Trillion cut, that is triangular, is also known: it was purchased in 2002 for 8 million dollars (about 5.4 million euros) by the jeweler from whom it takes the name. Baptized with the surname of the owner is also the third place, the Kazanjian Red, discovered in the Licthenburg mine in South Africa: it is 5.05 carats and has an emerald cut. In the past it had been mistaken for a ruby ​​due to its blood red color. It has an adventurous history: during the Second World War it was stolen by the Nazis and had various passages until it reached the hands of the president of Kazanjian Diamonds. The 5.03-carat De Young Red purchased in a real estate sale also suffered an error of assessment: it was mistaken for a garnet for its intense red tending to brown. It is also one of the few diamonds visible to all, as it is exhibited at the Smithsonian Museum in Washington.

Il diamante rosso Kazanjian
The Kazanjian red diamond

In short, red diamonds are so rare that most jewelers, even the most famous ones, have never seen one. Currently, 90 percent of the world’s natural pink and red diamonds come from a single source: the Argyle Diamond Mine in Western Australia. According to the officials of Rio Tinto, the company that owns the mine, these diamonds are almost impossible to find: the quantity of those mined in a year larger than half a carat is laughable and would fit in the palm of your hand. The best pieces are sold at the Pink Diamond Tender, one of the most important international auctions for this category and in 30 years only nine Fancy Red Argyle have been offered. One of these, 0.75 carats, was heart cut and ring mounted together with another diamond, the 0.71 carat Argyle Celestial in a deep blue gray. The combination of two stones with such a difficult cut makes the ring extraordinary. But the 1.56-carat Argyle Phoenix Fancy Red Diamond is the real star: it sold for more than $ 2 million, the highest price for a diamond produced by the mine. But beware, the value of red diamonds is constantly increasing because there are more and more: the Anglo-Australian multinational has planned to stop production.

Il diamante rosso Moussaieff
The Moussaieff Red Diamond
Diamanti rossi Argyle a forma di cuore e Phoenix taglio brillante
Brilliant-cut Phoenix and heart-shaped Argyle red diamonds

Tre anelli con diamanti Rio Diamond: bianchi, verde, blu e rosso
Three rings with Rio Diamond diamonds: white, green, blue and red

Anello con diamante rosso di 1,38 carati
1.38 carat red diamond ring

The secrets of champagne diamonds




Diamonds, but in a color ranging from caramel to cognac. They are champagne diamonds, very fashionable. Here’s how to recognize them and how they are ranked ♦

They are a new classic, but it is “forbidden” to call them brown diamonds. Rather, better the definition of champagne or cognac: these diamonds now accompany the jewels of celebrities and trend setters. The credit (or responsibility, it depends on the point of view) goes to the Rio Tinto mining company, the world’s largest producer of this type of gems, and to its market awareness operation, since almost no one until thirty years ago he knew or, rather, used this type of stone.

Anello chevalier con diamanti champagne
Colette Jewelry, anello chevalier con diamanti champagne

Of course, the road to convincing jewelers and professionals to use stones of softer and more golden tones as an alternative to colorless diamond, the classic one. But the idea of ​​associating the hue with a fine wine, champagne, and a luxury liqueur, cognac, was successful. In addition, the increase in demand for diamonds has actually widened the market and now these stones with golden shades are one of the main choices for making designer jewelry or in any case with a very contemporary taste. So much so as to push Argyle Diamonds (Australian mine owned by Rio Tinto) to certify for colorless stones a chromatic scale from C1 to C7, similar to that drawn up by Gia (Gemological Institute of America). In short, now even colored diamonds are scientifically cataloged and their evaluation does not depend only on the discretion of the jeweler. And this is a plus for all buyers. Here is the classification of Australian diamonds.

Orecchini in oro rosa con diamanti champagne
Orecchini in oro rosa con diamanti champagne by Pasquale Bruni

Is it worth buying a champagne diamond jewel? While not perfectly colorless diamonds were once considered second-rate gems, now that is no longer the opinion. Of course, traditional, colorless diamonds are still valued more than champagne ones. But the overall evaluation of the jewel weighs more. A simple ring with a small champagne diamond will still be valued a little less than a matching one, but perfectly colorless. But a well-made jewel and, above all, of a well-known and established brand, will be able to maintain its value over time and, with a little luck, even re-evaluate a lot.

Bracciale in oro rosa 14 carati e diamanti bianchi e champagne
Bracciale in oro rosa 14 carati e diamanti bianchi e champagne

The quality. Be careful, however, with the choice. As mentioned, quality also counts for champagne diamonds. In short, they are not all the same. Perfect clarity, the absence or almost the absence of inclusions, in addition of course to the carat weight, are elements to be carefully evaluated before buying a jewel. In short, a jewel with champagne diamonds must be a choice, not a fallback with second quality diamonds.

La scala cromatica Argyle Diamonds
La scala cromatica Argyle Diamonds

Origin. South Africa, Siberia and Australia. The Argyle mine in the remote East Kimberley region of Western Australia is the largest source in the world.

Color. comes from the heat and pressure exerted by the depths of the earth on the crystal lattice. In practice, this mechanism causes distortions in the diamond which absorbs them giving it a brown color. A phenomenon visible inside the stone as in parallel bands. Their natural color can be changed in the laboratory to orange, yellow or pink.

Diamanti naturali nelle sfumature champagne e cognac
Diamanti naturali nelle sfumature champagne e cognac

Orecchini a forma di elmetto romano, in oro e diamanti champagne e bianchi
Orecchini a forma di elmetto romano, in oro e diamanti champagne e bianchi
Orecchini in oro bianco, diamanti champagne
Mary Esses, orecchini in oro bianco, diamanti champagne

Anello con diamanti champagne
Etho Maria, anello con diamanti champagne

Spilla in oro giallo e rosa con diamanti champagne, brown, zaffiri orange
Spilla in oro giallo e rosa con diamanti champagne, brown, zaffiri orange by Chopard







Red to get mad




Rio Tinto presents the second largest red diamond in the world: the price is secret ♦ ︎
Riddle: it is a red, transparent stone, with a bright color, with radiant cut. What is it? No, it’s not a ruby. It is one of the rare red diamonds, one of the largest ever found, the second by size and weight. He presented it to New York with the mining giant Rio Tinto, along with other extraordinary colored stones.
The rare red diamond 2.11 carat, known as The Argyle Everglow, was the 2017 Arygle Pink Diamonds Tender star, which is the annual showcase of the rarest diamonds extracted from the Argyle mine in Rio Tinto. Argyle Everglow has been evaluated by the American Gemological Institute (Gia) as a Fancy Red VS2 diamond. Red is the rarest shade for diamonds. Suffice it to think that in 33 years from this mine Fancy Red certified less than 20 carats. The Fancy Red Argyle Everglow is the second largest Fancy Red diamond in the world after the Red Moussaieff, which has 5.11 carats. How much cost can a diamond like that? The price is top secret. Rio Tinto receives buyers’ offers in a closed envelope from dealers and collectors and does not divulge figures. Years ago, in Hong Kong, a red diamond of more than 2 carats was sold at auction for 5 million, about 2.4 every carat. For sure, according to experts, the price of these diamonds is not comparable to that of ordinary colorless diamonds. These are rather to be regarded as works of art.
Rio Tinto has featured 58 diamonds, totaling 49.39 carats, including four reds, four violet reds, two purple and one blue. The Argyle mine is located in the eastern region of Kimberley, Western Australia. Federico Graglia




Diamante Argyle Everglow, 2.11 carati, radiant shaped, Fancy Red diamond
Diamante Argyle Everglow, 2.11 carati, radiant shaped, Fancy Red diamond

Alcune dei diamanti colorati presentati da Rio Tinto
Alcune dei diamanti colorati presentati da Rio Tinto
Argyle Isla, 1.14 carat radiant shaped Fancy Red
Argyle Isla, 1.14 carat radiant shaped Fancy Red
Argyle Liberté, 0.91 carati radiant shaped, Fancy Deep Gray-Violet
Argyle Liberté, 0.91 carati radiant shaped, Fancy Deep Gray-Violet
Argyle Kalina, 1.50 carati, forma ovale, Fancy Deep Pink
Argyle Kalina, 1.50 carati, forma ovale, Fancy Deep Pink

Diamante Aryle Avaline. Taglio a forma di cuscino, Fancy Purple Pink, 2,42 carati
Diamante Aryle Avaline. Taglio a forma di cuscino, Fancy Purple Pink, 2,42 carati







Camelot’s diamonds

05A collection for the collectors who love the legend of Camelot, the one designed by Matthew Campbell Laurenza  for Diamond with a story, the Rio Tinto‘s project (https://gioiellis.com/rio-tinto-ha-una-story/). The pun can’t be avoided because everything revolves around the belief  of the American designer that collecting as an expression of personal style is not limited to the paintings and sculptures, but also applies to the jewelry. So, the accumulation is not aimed exclusively investment. So here are the pieces of Camelot, line inspired by the armor of the legendary King Arthur’s fortress, built in the category suggested by Rio Tinto, Mixed medium, ie creative freedom outside the rules and in innovation with precious materials. All at an affordable price, to be mixed together and then add each season: there are rings to put on top of each other, decorated with motifs reminiscent spears points and shields, very elaborate engagement rings and pendants with interchangeable stones : through to an ingenious mechanism can replace diamonds and change color in shades of gray, champagne, brown and black, from the Argyle mine in Australia. Monica Battistoni

 Matthew Campbell Laurenza, collezione Camelot anello in oro bianco openwork e diamanti in quattro gradazioni di colore: marrone, cognac, champagne e grigio
Matthew Campbell Laurenza, collezione Camelot anello in oro bianco openwork e diamanti in quattro gradazioni di colore: marrone, cognac, champagne e grigio
 Matthew Campbell Laurenza, collezione Camelot anello in oro giallo con diamanti
Matthew Campbell Laurenza, collezione Camelot anello in oro giallo con diamanti
 Matthew Campbell Laurenza, collezione Camelot anello in oro giallo con diamanti
Matthew Campbell Laurenza, collezione Camelot anello in oro giallo con diamanti
 Matthew Campbell Laurenza, collezione Camelot anello in oro giallo con diamanti
Matthew Campbell Laurenza, collezione Camelot anello in oro giallo con diamanti
 Matthew Campbell Laurenza, collezione Camelot anello in oro giallo con diamanti
Matthew Campbell Laurenza, collezione Camelot anello in oro giallo con diamanti
 Matthew Campbell Laurenza, collezione Camelot anello in oro giallo con diamanti
Matthew Campbell Laurenza, collezione Camelot anello in oro giallo con diamanti
 Matthew Campbell Laurenza, collezione Camelot orecchini in oro giallo con diamanti
Matthew Campbell Laurenza, collezione Camelot orecchini in oro giallo con diamanti

Rio Tinto has a story

Rio Tinto, one of the world’s major diamond producers  with mines in Canada, Australia and Zimbabwe, wants to rejuvenate the market and alongside the famous 4 C’s choice the real reasons people buy diamonds: love, emotion and, why not?, the beauty of a jewel that is not only in stone, but also in design. To do that had promoted the brand Diamond with a story and every year asks four talented jewelers to create a caspsule collection (for 2015 ere Sandy Leong, Jennifer Dawes, Suzanne Kalan and Matthew Campbell Laurenza), to be shown at Jck in Las Vegas. The idea behind the project is to provide traders jewelry at a very reasonable price for diamonds, ranging from 500 to $ 5,000, from more contemporary design and wearable every day all day. Something that for Millennials, customers with a maximum of thirty years the target stated, is different from what their parents wear, without being ostentatious or bling bling. Among the four themes suggested by Rio Tinto, the one of Sandy Leong is Shaped by origin, and the designer has chosen the rain as a creative motif to remember the immanence of nature. Rings, necklaces, earrings and bracelets are shaped with long raindrops in recycled gold  silky finished connected by gray or champagne diamonds from the Argyle mine in Australia. Here the first images of Rain the collection, next article the issues and proposals of the other three designers. Monica Battistoni

Sandy Leong, collezione Rain bangle in oro riciclato giallo, rosa e bianco con diamanti grigi e champagne
Sandy Leong, collezione Rain bangle in oro riciclato giallo, rosa e bianco con diamanti grigi e champagne
Sandy Leong, collezione Rain anello sottile e impilabile in oro riciclato giallo con 9 diamanti grigi
Sandy Leong, collezione Rain anello sottile e impilabile in oro riciclato giallo con 9 diamanti grigi
Sandy Leong, collezione Rain orecchini in oro giallo setato con gocce pendenti incastonate di diamanti
Sandy Leong, collezione Rain orecchini in oro giallo setato con gocce pendenti incastonate di diamanti
Sandy Leong, collezione Rain collana in oro riciclato giallo con lunghe gocce incastonate con diamanti grigi e champagne
Sandy Leong, collezione Rain collana in oro riciclato giallo con lunghe gocce incastonate con diamanti grigi e champagne
Sandy Leong, collezione Rain collana in oro riciclato giallo con una fila di lunghe gocce incastonate con diamanti grigi e champagne
Sandy Leong, collezione Rain collana in oro riciclato giallo con una fila di lunghe gocce incastonate con diamanti grigi e champagne
Sandy Leong, bracciale rigido in oro 18 carati con diamanti colorati naturali Rio Tinto della miniera Argyle. Prezzo: 5000 dollari
Sandy Leong, bracciale rigido in oro 18 carati con diamanti colorati naturali Rio Tinto della miniera Argyle. Prezzo: 5000 dollari

Race for four with certified diamonds

The mining giant Rio Tinto has charged four of the most famous American designers to create lines of jewelry with stones coming exclusively from the Argyle mine in Australia, and selected in size from 0.01 to 0.07 carats and in hues of colorless, gray, champagne and cognac. An initiative named Diamond with a story, taken some years ago with the aim to make these products more salable. Jennifer Dawes, Suzanne Kalandjian, Sandy Leong and Matthew Campbell Laurenza, are the designers chosen for their attention to sustainability, to range of color and to non-traditional materials, each of them have created a collection of 18 pieces with a price range of between 500 to $ 5,000, which will be presented at the Jck in Las Vegas, the trade show that is held in the city of Nevada in May. A marketing idea very interesting, for now restricted to the American market, considering that until a few years ago this type of diamonds was unknown and then regarded as of poor quality. Now, however, there is even a color scale certified. How the Chinese saying goes? Better a diamond with a flaw than a pebble without. Monica Battistoni 

Matthew Campbell Laurenza, anello in oro 18 carati con con diamanti colorati naturali Rio Tinto della miniera Argyle. Prezzo: 750 dollari
Matthew Campbell Laurenza, anello in oro 18 carati con con diamanti colorati naturali Rio Tinto della miniera Argyle. Prezzo: 750 dollari
Sandy Leong, bracciale rigido in oro 18 carati con diamanti colorati naturali Rio Tinto della miniera Argyle. Prezzo: 5000 dollari
Sandy Leong, bracciale rigido in oro 18 carati con diamanti colorati naturali Rio Tinto della miniera Argyle. Prezzo: 5000 dollari
Jennifer Dawes, orecchini in oro 18 carati con diamanti colorati naturali Rio Tinto della miniera Argyle. Prezzo: 1150 dollari
Jennifer Dawes, orecchini in oro 18 carati con diamanti colorati naturali Rio Tinto della miniera Argyle. Prezzo: 1150 dollari