Tips for stone care

Which gemstone is more expensive than a diamond?

The price of a diamond, like other precious stones, depends on many factors, and here size does not always matter. Gemology pedants even developed the 4C rule to make it easier for others to determine the price of stones. According to this method, when evaluating a diamond, one should take into account clarity (clarity), color (color), cut (cut) and weight in grams (carat). In addition, other parameters are taken into account that were not included in rule 4C (apparently because they did not find a suitable term for them with the letter C): shape and the presence or absence of flaws. In addition, the origin of the mineral and the country in which it was mined also play a role (who knew that jewelers were such snobs). Today, Australia, Africa and Russia are considered the most respected regions: diamonds from these suppliers are among the most expensive. Taking into account all these characteristics, the expert makes his verdict. As a rule, the cost fluctuates around 18-22 thousand dollars per carat (1,5-2 million rubles). If anything, a carat is 0,2 grams.

The cores are pure emerald

Emerald is a transparent variety of beryl whose grass-green color comes from chromium oxide or vanadium oxide. They are mined almost all over the world, but the leaders in terms of volume and quality of stones are Colombia, Zambia, Egypt, Brazil and Afghanistan. Emeralds are one of the most vulnerable creatures at an elite party of precious stones, and their fragility is comparable to the fragility of the ego of a creative person: literally anyone can offend them. The hardness of emerald is 7,5-8 on the Mohs scale (for comparison: diamond is 10). Add to this the complex network of splits and cracks, without which these minerals are practically never found, and you get an incredibly susceptible stone, very sensitive to heat and pressure. For example, emeralds easily lose light at temperatures above 700 °C. Therefore, large, defect-free gems (from 5 carats) are more valuable than diamonds, but even for a small stone you will have to pay an average of 7 thousand dollars. There are also more expensive copies – so much so that you will have to use all your intellectual potential to understand how something picked up on earth can compete with the GDP of some small developing country. For example, the President emerald weighing 1993 grams, found in 1200 at the Malyshevsky mine in the Sverdlovsk region, was valued by independent American experts at $1,5 million. The cost of the most famous representative of the breed – the 1383-carat Devonshire Emerald, stored in the mineralogical gallery of the British Museum of Natural History – is not even announced today.

The color of mood is not only blue

Sapphires are not only blue. And while you are digesting this information and figuring out at what point in your life it could hypothetically come in handy, here are some more details: sapphire is corundum colored in any color. An inconspicuous grayish mineral begins to shine with completely different colors when titanium or iron come into play. Thanks to these impurities, corundum receives a rich blue tint; we are accustomed to calling such stones sapphires. However, in addition to the classics, there is a whole palette: orange, pink-orange, garnet-red, yellow, green and pink minerals, as well as colorless ones. Traditional cornflower blue stones are valued at an average of $6 per carat, but padparadscha sapphires, with their pinkish-orange flower-inspired coloring, cost around $15 to $30 per carat, which is more expensive than diamonds. Unlike delicate emeralds, sapphire is real flint. It has high hardness (a solid Mohs nine), and to melt it, you need a temperature of 2040 °C. Sapphires are most often mined in placers in the USA, Australia, Madagascar, India, Sri Lanka, Vietnam, Burma, Thailand and China. There are no large deposits in Russia, but stones suitable for cutting can be found in the Urals and the Kola Peninsula. Ural stones will most often have a grayish tint, but Khibiny sapphires have a green cast and are distinguished by a deep blue color. The largest sapphire in history was found relatively recently: in 2015, miners at a mine in the Ratnapura region (Sri Lanka) stumbled upon a 1404-carat stone. According to the roughest estimates, its cost fluctuates around 90 million euros. And they called this find the “Star of Adam”, because in the drawing on the stone, with some effort of imagination, you can see a white blurry star.

Yakhontovy you are mine

Red corundums are called rubies, and their color is due to the admixture of chromium. These mineralogical neighbors of sapphires are distinguished by the same high hardness. They are unpretentious in their habitat: rubies are found everywhere except Antarctica. Ahead of the rest of the planet are Myanmar, Thailand, Sri Lanka. Rubies from East Africa, Kenya and Tanzania are also held in high esteem, but are valued slightly less. Since ancient times, they have been mined in the Pamir Mountains, for example, at the deposit with the bizarre name “Snezhnoye” in Tajikistan. In Russia, rubies are scarce: they are found only as rare companions of corundum in the Southern and Polar Urals, in Northern Karelia and on the Kola Peninsula. In one of the episodes, the heroes of the Discovery Channel project “Hunt for Precious Stones” go to the ruby ​​mines of Vietnam. A gem dealer, a jewelry expert, and a geologist travel to exotic lands to find the largest, brightest, and most expensive stones in the world. They will not only have to thoroughly study the rules of entry and exit from the country, but also competently evaluate local players, establish the authenticity of the goods, negotiate a purchase at the best price and, of course, flawlessly cut the stones, since otherwise the purchase will completely lose the price. Even our ancestors intuitively felt the kinship between sapphires and rubies: in Rus’ these minerals were called by the same word “yakhont”, sometimes adding to them the differentiation “red” and “azure”. However, today rubies are valued more than traditional blue sapphires, but pink padparadscha sapphires can compete with them: the price of rubies per carat is 15-20 thousand dollars. The record holder is considered to be a Burmese ruby ​​of the “pigeon’s blood” color: on May 13, 2015, a stone of 25,59 carats was sold at a Sotheby’s auction for $30 million. At that time, this was an unprecedented price for both an individual ruby ​​and per carat for a non-diamond stone.

Alexandrite

Alexandrite, although it sounds either like a verb or like a harmless chronic inflammation, was actually named in honor of Alexander II: the stone was discovered on the day when the future Russian emperor celebrated his coming of age. Alexandrite has an unusual history: Finnish geologist, corresponding member of the St. Petersburg Academy of Sciences Nils Nordenskjöld, who first came across this stone in 1834, initially suspected that it was not a completely pure emerald, since the mineral was obviously green in color. But after conducting an examination in the field, Nordenskiöld found out that the stone was much stronger than emerald: according to Mohs, it gave 8,5. “These are some kind of wrong bees,” Nordenskiöld decided, put the mineral in his pocket and brought it home. There he was surprised to find that the stone had changed color to bright red. Thus, not only a new breed was discovered, but also its amazing chameleon potential – what science calls pleochroism, that is, the ability of a stone to change color depending on lighting and viewing angle. In nature, in daylight, dark blue-green, bluish-green, dark grass-green and olive-green alexandrites are found. In evening or artificial light they appear pink-crimson, red-violet and purple. No matter what kind of chameleon you want to get, you will have to pay about 15-20 thousand dollars per carat. They are mined in large quantities in Russia. The Malyshevskoye field in the Urals contains the largest primary deposit in Europe. Sri Lanka also makes its contribution: alexandrite with a “cat’s eye” color is considered the hallmark of the region. In the 1980s, Brazil burst into the alexandrite market. True, the star of the state of Minas Gerais burned, although brightly, for a very short time: in just three months, from April to June 1987, the field was completely depleted and depleted. Today, Tanzania and Madagascar have become new suppliers of the mineral – the stones are found in the same places where rubies and sapphires are mined. In the TOP 10 gemstones, Christie’s included pearl, jadeite, sapphire, ruby, emerald and four diamonds: a D-color diamond, Oppenheimer Blue, Hancock Red and Winston Pink Legacy. A D-color emerald cut diamond of the highest specification will be featured in Christie’s Jewels Online auction, which the auction house will hold June 16-30. The gemstone is estimated to be worth between $1 million and $2 million. In the TOP 10 gemstones, Christie’s included pearl, jadeite, sapphire, ruby, emerald and four diamonds: a D-color diamond, Oppenheimer Blue, Hancock Red and Winston Pink Legacy. A D-color emerald cut diamond of the highest specification will be featured in Christie’s Jewels Online auction, which the auction house will hold June 16-30. The gemstone is estimated to be worth between $1 million and $2 million. D color diamond weighing 28,86 carats The 28,86-carat diamond will be the top lot of the auction, which will be held online, with an expected sale price of at least $1 million. In addition, this stone will be the most expensive lot ever offered for sale at Christie’s online auction. The value of this stone speaks to the auction house’s desire to move high-end items to a digital online sales platform. Emporium Gold salon offers to buy natural diamonds. All stones presented in the catalog are accompanied by a certificate from the GIA or the Gemological Center of Moscow State University. The favorable price of our salon will be a pleasant addition to a good financial investment. We accept payment in any form. We will deliver your order throughout Russia free of charge. “This year has brought unprecedented circumstances that have created new opportunities for Christie’s through our enhanced digital platform,” said Rahul Kadakia, head of Christie’s International Jewelry Department. Kadakia also noted that compared to last year, the auction house has seen an increase in online sales and an increase in the value threshold of transactions via the Internet, which indicates enormous customer confidence. A D color diamond has Type IIa clarity. This clarity is found in less than 2% of precious diamonds. Stones with this type of clarity are chemically pure and transparent. Such diamonds do not contain traces of nitrogen or other elements that affect the color of the crystal. Examples of diamonds with Type IIa clarity are the famous 530,2-carat Cullinan I and 105,6-carat Koh-i-Noor diamonds, both owned by the British Crown. Oppenheimer Blue Diamond The Oppenheimer Blue diamond was included in Christie’s list as the most expensive diamond in the history of the auction house. In addition, this diamond ranks third in the TOP 5 most expensive diamonds in the world. In 2016, at Christie’s Magnificent Jewels auction in Geneva, the value of this stone was $57,5 million. Hancock Red Diamond The small weight of the Hancock Red diamond did not prevent it from becoming the main lot at Christie’s New York auction in 1987. Although the diamond weighs 0,95 carats, its main value is its fancy purple-red color. Only one in a hundred thousand diamonds is endowed with a fancy color, and the rarity of fancy red colors is many times greater. Experienced diamond traders are considered lucky if they manage to take possession of more than three diamonds of this rare color. The price of the Hancock Red diamond was $800 thousand, which at that time made the stone the most expensive diamond sold at auction. Pink Diamond Pink Legacy Another diamond that Christie’s included in the TOP 10 gems that made history is the Pink Legacy diamond weighing 18,96 carats. “It’s almost impossible to find a diamond of this size with this color,” said Rahul Kadakia before the Pink Legacy sale in Geneva in November 2018. The owner of the stone was the jewelry company Harry Winston, paying $50,3 million for Pink Legacy. Pink diamonds regularly set price records, the latest record being a 10,64-carat pink diamond at Sotheby’s. The Emporium Gold salon will help you sell diamonds and jewelry profitably. In 90% of cases we offer the highest price in Moscow. For a preliminary assessment, leave an online application on our website or write to our WhatsApp, Viber, Telegram (+7-985-727-75-55). We pay the cost immediately in cash or by card.

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