For more than 400 years, Amsterdam is the City of Diamonds. The story of how Amsterdam became the diamond capital of the world, actually started over 600 years ago in Southern Europe. In that period of time, the Netherlands is known as the most tolerant country in Europe.

Surat, famous for its diamond cutting and polishing, is known as the Diamond City of India….Surat.

84% of the world’s mined diamonds end up in Antwerp. This is why Antwerp is the center of the world diamond trade. After WWII, trade started to slowy grow in Antwerp, due to the sound organization of import and export of the stones. …

Surat

Popularly known as the diamond city of the world, Surat is a hub for diamond cutting and polishing. It is referred as diamond city because 90 percent of the world’s diamonds are polished in this city.

Diamonds are cut and polished in Surat, India and the Chinese cities of Guangzhou and Shenzhen. India in recent years has held between 19–31% of the world market in polished diamonds and China has held 17% of the world market share in a recent year. Another important diamond center is New York City.

Top five diamond mining countries in the world

1. Russia. Home to arguably the richest and largest diamond resources in the world, Russia tops the list with more than 12 open-pit mines.
2. Botswana. Africa’s top diamond producer, Botswana sits second in this global list.
3. Democratic Republic of Congo.
4. Australia.
5. Canada.

Cutting edge Obsidian – a type of volcanic glass – can produce cutting edges many times finer than even the best steel scalpels. At 30 angstroms – a unit of measurement equal to one hundred millionth of a centimeter – an obsidian scalpel can rival diamond in the fineness of its edge.

No. Obsidian is relatively soft with a typical hardness of 5 to 5.5 on the mineral hardness scale. In comparison, quartz (crystallized silicon dioxide) has a hardness of 7.0. No, it is glass, glass does not cut steel.

Here are 10 of the sharpest and deadliest swords ever known in history.

• Honjo Masamune.
• Tizona. Source = Pinimg.
• The Flammard. Source = Thearma.
• Katana. Source = Swordsoftheeast.
• Longsword. Source = Medieval-weaponry.
• Curved Saber. Source = Liketimes.
• Tomoyuki Yamashita’s Sword. Source = Williammaloney.
• The Khopesh. Source = Tumblr.

Obsidian knife blades

The sharpest object ever made is a tungsten needle that tapers down to the thickness of a single atom. It was manufactured by placing a narrow tungsten wire in an atmosphere of nitrogen and exposing it to a strong electric field in a device called a field ion microscope.

They are used are used in modern medicine because the sharp blades create incisions which heal faster.

Obsidian

Samurai Myth No. A katana can chop a regular sword in half. Fact: Any steel sword can break if it’s struck at the wrong angle. Chopping one in half, however, is highly unlikely.

The Glass is a very hard material. With normal blade it is not possible to cut through it. It may be possible with Tungstun Crabide blade which you can use to cut it. But it will again not cut through, it will leave a scratch, which can be used to break it.

The final cut must be controlled in order to reach only half the neck of the samurai; the kaishaku, leaving the required skin to hold the head attached to the samurai’s body, was performed by a single slashing/withdrawing motion of the katana.

The sword wins, cutting the bullet in two. And with no dents, scratches or nicks in the blade. It’s extremely difficult to cut a human being in half at the torso, no matter how sharp your blade is.

Isao Machii

Although samurai no longer exist, the influence of these great warriors still manifests itself deeply in Japanese culture and samurai heritage can be seen all over Japan – be it a great castle, a carefully planned garden, or beautifully preserved samurai residences.