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The World’s Most Famous Diamonds

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The World's Most Famous Diamonds

The World’s Most Famous Diamonds

The stories and histories of the most famous diamonds

You may have heard of the Cullinan Diamond or the Hope Diamond before, but do you know the stories behind these legendary finds?

Today’s infographic looks at the history and characteristics of six of the most famous diamonds.

A Diamond Primer

Every diamond is unique, and as a result the value of a particular diamond is partially determined by the eye of the beholder. The diamond industry generally uses a set of criteria called the Four C’s to help evaluate the potential value of a diamond: Clarity, Cut, Carats, and Color.

Most diamonds found have major deficiencies in one or more of the above categories. For example, while a diamond may be clear and large in size, it may have a less desirable color and shape. In a previous infographic, we explain the importance of these characteristics in more depth, and we’ve also previously posted on the significance of rare-colored diamonds.

The most famous diamonds in the world are exceptionally rare: they tend to excel in all four of the above categories. They are a desired color and shape, have great clarity, and are giant in size.

The Most Famous Diamonds

The stories behind six of the most famous diamonds in brief:

The Cullinan Diamond: Perhaps the most well-known, the Cullinan Diamond was discovered in 1905 in South Africa. Weighing in at 3,106.75 carats, the Cullinan is the largest rough gem-quality diamond ever discovered. The diamond was ultimately cut into nine smaller stones including the 530.20 carat Star of Africa, which is valued at over $400 million alone.

The Hope Diamond: The Hope Diamond is a grayish-blue diamond that was discovered in India at an unknown date. It has a long history, in which it changed hands numerous times between countries and eventually ended up at the Smithsonian Institute in Washington, D.C.

The Centenary Diamond: The Centenary Diamond is considered to be one of the most flawless diamonds, both internally and externally. Discovered in South Africa, it was unveiled in its final form by De Beers in 1991. The current owner is unknown.

The Regent Diamond: This pale blue diamond was discovered by a slave in India in 1698. After eventually making it to the crowns of Louis XV and Louis XVI in France, it is now on display at the Louvre in Paris and weighs 140.64 carats.

The Koh-i-Noor Diamond: Meaning “Mountain of Light” in the Persian language, this diamond was discovered at a mine in India. It is of the finest white color, and made its way from a Hindu temple eventually to the Crown of Queen Elizabeth in 1850.

The Orlov Diamond: Discovered in India at an unknown date, this jewel retains its traditional Indian rose-style cut. The Orlov, which weighs in at 189.62 carats and is white with a faint bluish-green color, now rests in the Kremlin in Russia.

The world’s most famous diamonds all have intriguing stories behind their discoveries. However, a diamond prospector doesn’t need to find a diamond to strike it rich: check out the infographic story of Diamond Fields, a diamond company that ended up finding and auctioning off one of the world’s richest nickel deposits for billions.

Original graphic by: Gear Jewellers

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Base Metals

Prove Your Metal: Top 10 Strongest Metals on Earth

There are 91 elements that are defined as metals but not all are the same. Here is a breakdown of the top 10 strongest metals and their applications.

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Prove Your Metal: Top 10 Strongest Metals on Earth

The use of metals and the advancement of human civilization have gone hand in hand — and throughout the ages, each metal has proved its worth based on its properties and applications.

Today’s visualization from Viking Steel Structures outlines the 10 strongest metals on Earth and their applications.

What are Metals?

Metals are solid materials that are typically hard, shiny, malleable, and ductile, with good electrical and thermal conductivity. But not all metal is equal, which makes their uses as varied as their individual properties and benefits.

The periodic table below presents a simple view of the relationship between metals, nonmetals, and metalloids, which you can easily identify by color.

The Periodic Table

While 91 of the 118 elements of the periodic table are considered to be metals, only a few of them stand out as the strongest.

What Makes a Metal Strong?

The strength of a metal depends on four properties:

  1. Tensile Strength: How well a metal resists being pulled apart
  2. Compressive Strength: How well a material resists being squashed together
  3. Yield Strength: How well a rod or beam of a particular metal resists bending and permanent damage
  4. Impact Strength: The ability to resist shattering upon impact with another object or surface

Here are the top 10 metals based on these properties.

The Top 10 Strongest Metals

RankType of MetalExample UseAtomic WeightMelting Point
#1TungstenMaking bullets and missiles183.84 u3422°C / 6192 °F
#2 SteelConstruction of railroads, roads, other infrastructure and appliancesn/a1371°C / 2500°F
#3ChromiumManufacturing stainless steel51.96 u1907°C / 3465°F,
#4TitaniumIn the aerospace Industry, as a lightweight material with strength47.87 u1668°C / 3032°F
#5IronUsed to make bridges, electricity, pylons, bicycle chains, cutting tools and rifle barrels55.85 u1536°C / 2800°F
#6Vanadium80% of vanadium is alloyed with iron to make steel shock and corrosion resistance50.942 u1910°C / 3470°F
#7LutetiumUsed as catalysts in petroleum production.174.96 u1663 °C / 3025°F
#8ZirconiumUsed in nuclear power stations.91.22 u1850°C / 3.362°F
#9OsmiumAdded to platinum or indium to make them harder.190.2 u3000°C / 5,400°F
#10TantalumUsed as an alloy due to its high melting point and anti-corrosion.180.94 u3,017°C / 5462°F

Out of the Forge and into Tech: Metals for the Future

While these metals help to forge the modern world, there is a new class of metals that are set to create a new future.

Rare Earth elements (REEs) are a group of metals do not rely on their strength, but instead their importance in applications in new technologies, including those used for green energy.

MetalUses
NeodymiumMagnets containing neodymium are used in green technologies such as the manufacture of wind turbines and hybrid cars.
LanthanumUsed in catalytic converters in cars, enabling them to run at high temperatures
CeriumThis element is used in camera and telescope lenses.
PraseodymiumUsed to create strong metals for use in aircraft engines.
GadoliniumUsed in X-ray and MRI scanning systems, and also in television screens.
Yttrium, terbium, europiumMaking televisions and computer screens and other devices that have visual displays.

If the world is going to move towards a more sustainable and efficient future, metals—both tough and smart—are going to be critical. Each one will serve a particular purpose to build the infrastructure and technology for the next generation.

Our ability to deploy technology with the right materials will test the world’s mettle to meet the challenges of tomorrow—so choose wisely.

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Chart of the Week

Visualizing the Life Cycle of a Mineral Discovery

Building a mine takes time that poses risks at every stage. This graphic maps a mineral deposit from discovery to mining, showing where value is created.

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Visualizing the Life Cycle of a Mineral Discovery

Mining legend Pierre Lassonde knows a little bit about mineral exploration, discovery, and development. Drawing from decades of his experience, he created the chart above that has become a staple in the mining industry—the Lassonde Curve.

Today’s chart of the Lassonde Curve outlines the life of mining companies from exploration to production, and highlights the work and market value associated with each stage. This helps speculative investors understand the mining process, and time their investments properly.

Making Cents of Miners: The Stages of a Mineral Discovery

In the life cycle of a mineral deposit, there are seven stages that each offer specific risks and rewards. As a company proves there is a mineable deposit in the ground, more value is created for shareholders along the way.

  1. Concept

    This stage carries the most risk which accounts for its low value. In the beginning, there is little knowledge of what actually lies beneath the Earth’s surface.

    At this stage, geologists are putting to the test a theory about where metal deposits are. They will survey the land using geochemical and sampling techniques to improve the confidence of this theory. Once this is complete, they can move onto more extensive exploration.

  2. Pre-Discovery

    There is still plenty of risk, but this is where speculation hype begins. As the drill bit meets the ground, mineral exploration geologists develop their knowledge of what lies beneath the Earth’s crust to assess mineral potential.

    Mineral exploration involves retrieving a cross-section (drill core) of the crust, and then analyzing it for mineral content. A drill core containing sufficient amounts of metals can encourage further exploration, which may lead to the discovery of a mineable deposit.

  3. Discovery

    Discovery is the reward stage for early speculators. Exploration has revealed that there is a significant amount of material to be mined, and it warrants further study to prove that mining would be feasible. Most speculators exit here, as the next stage creates a new set of risks, such as profitability, construction, and financing.

  4. Feasibility

    This is an important milestone for a mineral discovery. Studies conducted during this stage may demonstrate the deposit’s potential to become a profitable mine.

    Institutional and strategic investors can then use these studies to evaluate whether they want to advance this project. Speculators often invest during this time, known as the “Orphan Period”, while uncertainty about the project lingers.

  5. Development

    Development is a rare moment, and most mineral deposits never make it to this stage. At this point, the company puts together a production plan for the mine.

    First, they must secure funding and build an operational team. If a company can secure funding for development, investors can see the potential of revenue from mining. However, risks still persist in the form of construction, budget, and timelines.

  6. Startup/Production

    Investors who have held their investment until this point can pat themselves on the back—this is a rare moment for a mineral discovery. The company is now processing ore and generating revenue.

    Investment analysts will re-rate this deposit, to help it attract more attention from institutional investors and the general public. Meanwhile, existing investors can choose to exit here or wait for potential increases in revenues and dividends.

  7. Depletion

    Nothing lasts forever, especially scarce mineral resources. Unless, there are more deposits nearby, most mines are eventually depleted. With it, so does the value of the company. Investors should be looking for an exit as operations wind down.

Case Study: The Oyu Tolgoi Copper-Gold Discovery, Mongolia

So now that you know the theoretical value cycle of a mineral discovery, how does it pan out in reality? The Oyu Tolgoi copper deposit is one recent discovery that has gone through this value cycle. It exemplifies some of these events and their effects on the share price of a company.

  1. Concept: 15+ Years

    Prospectors conducted early exploration work in the 1980s near where Oyu Tolgoi would be discovered. It was not until 1996 that Australian miner BHP conducted further exploration.

    But after 21 drill holes, the company lost interest and optioned the property to mining entrepreneur Robert Friedland and his company Ivanhoe Mines. At this point in 1999, shares in Ivanhoe were a gamble.

  2. Pre-Discovery/Discovery: ~3 years

    Ivanhoe Mines and BHP entered into an earn-in agreement, in which Ivanhoe gained ownership by completing work to explore Oyu Tolgoi. A year later, the first drill results came out of drill hole 150 with a headline result of 508 meters of 1.1 g/t Au and 0.8%. To get a sense of how large this is, imagine the height a 45-story building, of which a third of story is copper. This was just one intersection of an area that could stretch for miles.

    Wild speculation began at this stage, as steadily improving drill results proved a massive copper-gold deposit in Mongolia and drove up the share price of Ivanhoe.

  3. Feasibility/Orphan Period: ~2 years

    In 2004, the drilling results contributed to the development of the first scoping study. This study offered a preliminary understanding of the project’s economics.

    Using this study, the company needed to secure enough money to build a mine to extract the valuable ore. It was not until two years later, when Ivanhoe Mines entered into an agreement with major mining company Rio Tinto, that a production decision was finalized.

  4. Development: 7 years

    By 2006, the Oyu Tolgoi mineral deposit was in the development phase with the first shaft headframe, hoisting frame, and associated infrastructure completed. It took another two years for the shaft to reach a depth of 1,385 feet.

    Further development work delineated a resource of 1.2 billion pounds of copper, 650,000 ounces of gold, and 3 million ounces of silver. This first stage of development for Oyu Tolgoi made Mongolia the world’s fastest growing economy from 2009 to 2011.

  5. Startup/Production: Ongoing

    On January 31, 2013, the company announced it had produced the first copper-gold concentrate from Oyu Tolgoi. Six months later, the company stated that it was processing up to 70,000 tonnes of ore daily.

  6. Depletion: Into the Future

    The Oyu Tolgoi deposit will last generations, so we have yet to see how this will affect the value of the mine from an investment perspective.

    It’s also worth noting there are still other risks ahead. These risks can include labor disruptions, mining method problems, or commodity price movement. Investors will have to consider these additional conditions as they pan out.

  7. The More You Know

    Mining is one of the riskiest investments with many risks to consider at every stage.

    While most mineral discoveries do not match it perfectly, the Lassonde Curve guides an investor through what to expect at each stage, and empowers them to time their investments right.

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