Everyday Science: Diamond Quiz

Estimated Completion Time
1 min
Everyday Science: Diamond Quiz
Image: Plume Creative/Stone/Getty Images

About This Quiz

A famous slogan claims that a diamond is forever. While these precious stones symbolize love and glamour for millions of couples, there's a lot about nature's most famous jewel you might not know.
A diamond is ________ in its most concentrated form.
carbon
potassium
silicon
Correct Answer
Wrong Answer

A diamond is carbon in its most concentrated form, the same element that makes up 18 percent of the weight of a human body.

Advertisement

Diamonds form:
at the bottom of certain parts of the Indian Ocean
in certain types of caves just below the Earth's surface
about 100 miles below the Earth's surface, in the mantle's molten rock
Correct Answer
Wrong Answer

Most diamonds were formed millions of years ago, far below Earth's surface, in the mantle's molten rock. In the mantle, about 100 miles below the surface, the right combination of temperature and pressure acts on carbon and transform it into diamonds. In order for a diamond to be created, carbon must be placed under at least 435,113 pounds per square inch (psi, or 30 kilobars) of pressure at a temperature of at least 752 degrees Fahrenheit (400 degrees Celsius).

Advertisement

Kimberlite pipes are named after:
Kimberley, the daughter of the founder of diamond cartel De Beers
Kimberlite, the rarest and most precious kind of diamond in the world
Kimberley, South Africa, the location where these pipes were first found
Correct Answer
Wrong Answer

When powerful magma eruptions bring diamonds that were formed in the Earth's mantle to the surface, kimberlite pipes are created. The magma eventually cools inside these pipes, leaving behind conical veins of blue kimberlite rock that contain diamonds. They're named after Kimberley, South Africa, the place where they were first found.

Advertisement

On the Mohs Hardness Scale, a diamond is a:
1
7
10
Correct Answer
Wrong Answer

The diamond sits atop the Mohs Harness Scale with a ranking of 10, meaning it can scratch any mineral and can only be scratched by another diamond. Its hardness can be attributed to its molecular structure, a lattice in which each carbon atom shares electrons with four other carbon atoms, forming a tetrahedral unit and a very strong molecule.

Advertisement

Bruiting a diamond refers to the process of:
cutting a diamond by hand using a special instrument
rubbing a diamond with a special powder to give it a smooth, polished finish
breaking a rough diamond down to a manageable size
Correct Answer
Wrong Answer

Bruiting is the process that gives a diamond its shape by cutting it by hand. Cutters do this by using the only thing able to cut a diamond -- another diamond.

Advertisement

Which of the following is true about most diamonds?
They are cut using cleaving, not bruiting.
They never reach the consumer market because they are too flawed.
They're naturally red but lose their color after polishing.
Correct Answer
Wrong Answer

It might surprise you, but most diamonds never make it to the case of your local jewelry store because they are too flawed. Those that don't make the cut are used for industrial purposes, as drill bits and to cut other diamonds.

Advertisement

The color of the most expensive transparent diamond is:
sky blue
icy white
pale yellow
Correct Answer
Wrong Answer

The color scale for transparent diamonds runs from D to Z.. Icy white is the most expensive transparent diamond and is at the start of the scale. A transparent diamond is one created from 100 percent carbon.

Advertisement

The select people or companies authorized to buy rough diamonds from De Beers are called:
gemsmen
shareholders
sightholders
Correct Answer
Wrong Answer

There are fewer than 200 people or companies authorized to buy rough diamonds from De Beers. These people are called sightholders, and they purchase the diamonds through the Central Selling Organization (CSO), a subsidiary of De Beers that markets about 70 to 80 percent of the world's diamonds.

Advertisement

Blood diamonds are:
named for the bloodshed and human rights violations often required to obtain them
a very rare type of red diamond that is one of the most expensive in the world
diamonds that are handed down from generation to generation in one family
Correct Answer
Wrong Answer

Blood diamonds, also known as conflict diamonds, are named for the blood that is often shed before the diamonds are sold. Militia and terrorist organizations force men, women and children in Africa to locate these diamonds. When the diamonds are sold, the militia and terrorist groups use the funds to purchase weapons and prolong their reign of terror. The United Nations (UN), the Conflict Free Diamond Council and other groups are working toward better regulation so conflict diamonds don't make it to the market.

Advertisement

The largest diamond ever found was called the:
Cullinan
Excelsior
Great Mogul
Correct Answer
Wrong Answer

Discovered in 1905 in Transvaal, South Africa, the Cullinan is the largest diamond ever found, weighing a whopping 3106 carats. The diamond was presented to King Edward VII of England in 1907 and later cut into nine major stones.

Advertisement

You Got:
/10
Plume Creative/Stone/Getty Images