Rough Polished Diamonds
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Rough Polished Diamonds
Rare earth elements (REEs), rare earth metals (REMs), rare earth metal oxides, rare earths - these are the names of 17 metals of the future the world powers are competing for. It is referred to, in particular, scandium, yttrium and 15...
Both production and demand for platinum were under pressure in the first half of this year. Supply has been hit by disruptions in South Africa, where major producers have adjusted production targets amid bad weather and drawdown of work-in-progress inventories...
( marketscreener.com ) - The London Metal Exchange's (LME) controversial suspension of its nickel contract in March didn't just impact trading in London. In the immediate aftermath of the LME intervention, the Shanghai Futures Exchange (ShFE) was forced...
( miningmx.com ) - The World Platinum Investment Council (WPIC) increased its forecast platinum surplus for 2022 to 974,000 ounces following a second quarter surplus of 349,000 oz. The deterioration in the forecast came despite declines in metal supply from Russia...
( miningmx.com ) - When three of South Africa’s wealthiest families engage in some discreet business dealings, it’s perhaps worth taking a second look. In September last year, Christo Wiese sold his 13.72% stake in Gemfields, a Johannesburg- and London-listed mining...
Lucapa Diamond has recovered a 131-carat white Type IIa diamond at its 40%-owned Lulo diamond mine, in Angola. The stone is the 29th +100 carat diamond ever recovered from Lulo and the fourth +100 carat diamond recovered at the mine this year.
Jewellery sales in the China in August 2022 continued to perform positively like the previous month, as the Chinese government gradually moved to relax strict Covid regulations during the month.
The rise in the price of gold to 1,680 US dollars per troy ounce is a negative signal for both the yellow metal and silver, according to a report by UBS Group AG. One of the largest Swiss financial holdings, which provides a wide range of financial services to clients around the world, predicts the price of gold at the end of the year at $1,600 per ounce, while warning of its possible fall to $1,500.
Namibia’s state-owned diamond trading company, Namib Desert Diamonds (Namdia) unveiled a polished 15.06 carats diamond, dubbed the Eumbo Star, in Walvis Bay. New Era reports that the stone was named after the Namdia building where several Namibians found refuge in the building pre-independence.
After a successful 1st edition of India Gem & Jewellery Show (GJS) in April this year, the All India Gem and Jewellery Domestic Council (GJC), the apex industry body representing the jewellery sector in India is all set to organize the Diwali Edition (2nd edition) of mega B2B expo from 22nd To 25th September at Bombay Exhibition Center (NESCO), Mumbai.
Some South Africans have called for United Kingdom Royal Family to return a diamond on the late Queen Elizabeth II’s sceptre. CNN reports that more than 6,000 people had signed a petition asking for the return of the diamond.
Citing concerns for lives of hundreds of indigenous people, a local government in the Philippines has cancelled permit issued to Sagittarius Mines for the $5.9 billion Tampakan copper-gold project. The asset, which has estimated resources of 15 million tonnes of copper and 17.6 million ounces of gold, was one of at least 12 metallic mines expected to begin commercial operations this year.
Saudi Arabia has announced the discovery of new sites for gold and copper ore deposits in the Madinah region. The Saudi Geological Survey represented by the Survey and Mineral Exploration Centre said that the discoveries of gold deposits were in Aba Al-Raha in the Madinah region, while copper ore was located across four sites in the Al-Madiq area in the same region.
Anglo American Platinum continues to make significant investments in South Africa’s hydrogen economy, according to a company spokesperson. The Platinum Group Metals (PGMs) miner’s external communication principal Nomonde Ndwalaza told Rough&Polished’s...
Ellen Joncheere, CEO of HRD Antwerp, in an exclusive interview with Rough&Polished told about the history of the HRD Design Awards and its new, 18th edition.
Ghanshyam Dholakia, born in a farmers’ family in a remote village Dudhala in Gujarat was inspired along with his siblings by his father to follow their destiny and this led them to Surat city - a world of opportunities! In the early seventies, Ghanshyam’s...
Shashikanth Dalichand Shah, Chairman of Lab Grown Diamond & Jewelry Promotion Council (LGDJPC), has been promoting the lab-grown diamond and jewellery sector for the past few years spreading awareness of lab-grown diamonds and helping and educating...
Anglo American’s 85%-owned De Beers Group, which has operations across the diamond pipeline from exploration to retail, wants to protect the environment. Group spokesperson David Johnson told Mathew Nyaungwa’s Rough&Polished in an exclusive interview...
A diamond is just a sparkling little colorless rock that looks pretty in an engagement ring, or set into a pendant or pair of earrings. So why is it the center of every engagement, the symbol for all things valuable and precious, and the proverbial girl’s best friend? How is a rough diamond made into a sparkling gem? Why do we buy diamonds anyway?
The difference between a piece of rough diamond and a finished jewel is a time-consuming process of cutting and polishing. The secrets of diamond cutting have been honed over generations, passed down in the small circles of knowledgeable diamond experts. When you buy a certified loose diamond, you hold a piece of that secret knowledge and expert craftsmanship in your hand.
A rough diamond crystal has none of the sparkle and brilliance of a cut diamond
Cutting diamonds is unlike cutting any other gem because of the unique hardness and value of the diamond. Diamond cutting requires special knowledge, tools and techniques, and is done in only a few cities worldwide. Antwerp, Belgium is one major diamond cutting center, as well as Surat, India. Cut diamonds are also manufactured in New York City and Tel Aviv, Israel. When you buy diamonds, you are purchasing a piece of that globe-circling tradition.
The first step of diamond cutting is planning. The diamond cutter analyzes the rough diamond with computer imaging technology and with his own highly trained eyes to determine how the loose diamond will be cut. He tries to plan a diamond shape that will maximize the size of the finished stone and minimize waste, as well as a popular shape that will sell quickly. Any inclusions or imperfections are notes and incorporated into the 3-D computer model, so the cutter can cut the stone in a way that excises or hides the imperfections.
Computer imaging helps the cutter plan the ideal cut for each crystal
During the planning process, the cutter evaluates the yield and weight retention of the diamond. His goal is to extract maximum value from each piece of rough. This means that he looks for the best way to create a finished gem on the basis of its per carat value. For example, by one plan a 2.00 carat rough diamond may produce two gems of .50ct each when finished. Planning differently might yield diamonds of .70ct and 30ct. If the value of the latter combination is more than the former, then that is what his plan will be. Clarity characteristics or inclusions in the rough stone will also factor in to the plan as certain approaches might exclude some flaws thereby increasing the value of the finished diamond.
Nothing replaces the painstaking process of examining each stone by hand
The natural shape of the diamond crystal will also impact what shape diamond is cut. Octahedron crystals are usually cut in round or square brilliant cuts, while odd shaped crystals such as macles will often be cut into fancy shapes like emerald or radiant.
Despite the cutter’s skill and precision and the advanced technology used, the cutting of a diamond always results in the loss of about half the weight of the original rough diamond. The planning stage of diamond cutting always involves critical decisions balancing cut quality against carat weight. Certain carat weights are considered special such as 1.00, 1.50 and 2.00. You will often see liberties taken with cut quality of stones right at these “magic marks”. To perfect the cut often means dropping below them and therefore losing some per carat value. This is because diamond per carat value is a geometric progression as the diamond gets bigger in size and rarer in nature. For example, where a 1.00 ct diamond is worth X , a 2.00 ct diamond may be work 3X. So the price per carat increases for the same quality as the diamond increases in size, compounding the total value of larger diamonds.
The next stage of diamond cutting is cleaving or sawing. This involves the use of a diamond-edged saw or laser to carefully cut the diamond into the specified pieces. Because of the diamond’s natural hardness, the saw must be edged with actual diamonds in order to cut through the rough stone.
The diamond then undergoes the process of bruting. Two diamonds are set on spinning axles and made to grind against each other, to shape each diamond into its destined round shape. Next is the crucial step of brillianteering—the delicate and all-important placement and cutting of the facets. This step is one of the most important in determining the light performance and brilliance of the finished diamond. Finally, the diamond is polished—facets are cut into the stone and the cut surfaces are polished to a mirror finish.
Of course, after the diamond is cut and polished, it is thoroughly inspected. The loose diamond is cleaned in acids to ensure that not a speck of dust remains, and then it is examined to see if it meets the quality standards of the manufacturer. Not all manufacturing facilities are alike—some hold each diamond to the highest standards of excellence, while others focus on mass-producing diamonds cheaply.
Cut diamonds are sorted before being packaged and sent to wholesale markets
Once inspected, the diamond is sent to grading facilities and labs to be officially weighed and measure as well as graded for color, clarity, cut and cut quality. Each certified diamond is given a unique report number. Some retailers buy diamonds for their own inventory while others are brokers who sell diamonds that are loaned to them on consignment.
A truly well-cut diamond has un-matched brilliance and fire
Finally, the diamond arrives into your hand, either loose or possibly set into a brilliant engagement ring. The many facets act as tiny mirrors creating a sparkling display of light. The end result is a mesmerizing tribute to ancient knowledge and modern technology, and an eternal symbol of love and devotion.
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Diamonds: From Rough to Polished
Rough diamonds come in all shapes and sizes.
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Dessert, Champagne & Diamonds. The essentials.
We all remember the mining scene in Disney’s Snow White, with the seven dwarfs working their way through the ore in a mine filled with sparkling, shiny diamonds, right? How easy would it be if this would be reality: ready-made, beautifully polished diamonds sitting in the mines, waiting to be unearthed and set into jewelry. Unfortunately, not all rough diamonds are created equal, and they’re definitely not all pretty. They come in all shapes and sizes, and need to undergo a laborious make-over process before they become the sparkling, beautiful gemstones we love.
When a rough diamond arrives at the diamond polisher, the first step is to make a 360° digital mapping of the stone and start the planning process. Every diamond is unique, and therefor asks for a unique, custom-made approach. When you’re lucky, your rough diamond is perfectly shaped into a double pyramid: an octahedron. The octahedron can be cut in half, and you already have 2 shapes that resemble the desired result, reducing volume loss and making it easier to polish. Octaheder-shaped diamonds are very common, but they also come in a range of other shapes: from flat triangles to formless blobs.
The job of the polisher: using advanced software and his expertise to analyze the stone and find the best solution to maximize the result. This means: turning the rough stone into one or more polished diamonds, balancing the biggest size, best proportions and minimal to no inclusions to attain maximum profit.
When the planning part is done, it is time to start working on the actual stone. Most rough diamonds get divided in two or more pieces. Today, this is almost exclusively done by laser cutting. Another method is sawing the stone with a thin, copper blade covered in diamond powder. Laser cutting is a lot quicker and easier and is the preferred method, but sometimes diamonds still get sawed – for example when there is lot of tension in the stone and laser cutting would put too much pressure on it. An older method, that is no longer practiced today, is called ‘Cleaving’: splitting the diamond in two with a single blow of hammer and chisel.
The next step is bruting the girdle of the stone. A machine moves the diamond against a spinning wheel covered in diamond powder, making the girdle round.
The basic shape is now done, so it’s time to start adding facets! The first 8 facets on the pavilion and the crown of the stone get blocked in first, followed by the 16 main facets on each side. After that more and more smaller facets get added to those, until you get 56 facets spread on both sides of the diamond, and one top facet: the ‘table’.
All of this happens at the polishing wheel, a cast iron disc covered in diamond powder and oil or glue, spinning at a speed of 3,500-5,000 rotations per minute. The polisher attaches the diamond to a diamond tang, a special arm with clasp that holds the diamond. Fun fact: this polishing technique is quite old and dates back until the 14th century, but scientists haven’t been able to explain yet how this process actually works. Is it a whetting, a chemical or a thermal process that results in the diamond being polished? No-one knows, but it works and that’s what matters!
When all the facets are done, the very last step is to make sure that every little facet is completely smooth and even, and make a last check for symmetry, polish and to see if all the angles are perfect. As you can imagine, this whole process takes up quite some time, going back and forth between the polisher and planner until the ideal result is met (the fact that diamond is the hardest material we know doesn’t help either). On average, a stone looses about 60% of its weight during the polishing process. But in the end, it’s all worth it!
Dessert, Champagne & Diamonds. The essentials.
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BUY WITH CONFIDENCE | RDW is a New York City-based diamond dealer. All our diamonds comply with UN Kimberly regulations.
As Kimberley Licensees, we have a responsibility to maintain the highest standards when sourcing our diamonds. We source our rough only from Kimberley Process compliant nations and send them to our certified fair trade facility to be polished. We are 100% committed to ethical sourcing as our best practice.
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The term rough diamonds refer to diamonds that are straight from the earth and completely untouched by a polishing wheel or tumbler. All of our rough diamonds are earth mined.
The term rough diamonds refer to diamonds that are straight from the
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