10 Gemas mais raras no Mundo

10 Rarest gems in the World
Diamonds are beautiful and very rare, but there are gems out there much harder to find. Many, for their rarity, they end up having an exorbitant market value, even without having a practical use in addition to use in jewelry. 

Actually there is no consensus on which is the rarest gemstone in the world, since there is also a consensus on the definition of "rarity", according to the Gemological Institute of America. The price is also somewhat difficult to determine, since it can vary greatly depending on the purity of the gem and even its history. 

Some of them are found in only one or two places on the planet and are rarely seen. Thus, you will have more difficulties to stumble across one of these in the corner.

Note: Not listed.

Tanzanite

  This transparent blue gem was discovered in 1962 in northern Tanzania, Africa. She was popularly known after the presentation of Tiffany & Co in 1968.
  Her beauty is mainly due tricroísmo, which splits a light beam into three beams of different lengths (sapphire blue, violet and green). However, tanzanite receives an artificial heat treatment to improve its color, which significantly reduces its tricroísmo.
(10,000 times rarer than diamond)



Red Diamond

  Red diamonds are even more rare and precious than diamonds roses. Like all diamonds, are made primarily of carbon, but the red color is formed by a deformation of the lattice, making it the rarest of diamonds. 
  Only a few red diamonds are considered pure and without traces of other colors. Australia is where most of them are found, but have also been found in Brazil. A red diamond ever came to be sold for the incredible price of $ 1.15 million / carat. 

Painite

  Discovered in 1951 in Mogok, Burma, painite has been in the past considered the rarest mineral in the world. For decades, only two crystals were found. 
  Its chemical formula contains calcium, zirconium, boron, aluminum and oxygen, and traces of chromium and vanadium. But no need to write down, you will not make this at home. 
  Today, nearly a thousand crystal fragments were found, but only very few of them are good enough to be sold. Therefore, its price is valued at approximately $ 50,000 / carat. 

Jadeite

  Jadeite should not be confused with jade. Jade is the term used to refer to both jadeite as nephritis. Between the two, jadeite is only considered a rare gem. 
  As the best gem jadeite has been found in Burma, other sources include Guatemala, Russia, Japan and the United States. In 1997, a jadeite necklace was sold for U.S. $ 9.3 million. 

Jeremejevite

  The jeremejevite, was discovered in 1883 and named after Pavel V. Jeremejev a Russian engineer and mineralogist. 
  The best stones are found in Namibia, but other deposits were found in Burma. The jeremejevita can be yellow, blue (aquamarine), purple or even colorless. 

Musgravite
  The musgravite is so rare that it was only discovered in 1967 in the region of Musgrave Range in Australia. In fact, it is a rarity even among the rare stones. To date, only 8 stones were found on the planet. 
  Its basic components are beryllium (Be), magnesium (Mg) and aluminum (Al). The price of your carat can reach $ 35,000. For comparison, the average price of a common carat diamond is $ 14,000. 

Pink Diamond

  Roses and diamonds are rarer than the "common" or colorless diamonds with dashes of yellow and brown. Recently, a pink diamond was sold for the incredible price of $ 83 million at auction house Sotheby's in Geneva. 

Black Opal
  Opal is a gem found in Australia. It can be found in various colors like white, gray and yellow, but the black opal is the rarest and hard to find. 
  Its price can reach up to compete with the rarest diamonds, but for that she needs to have a black background. Sometimes several of these colors can be seen at the same time, thanks to interference and diffraction of light passing through openings in the microstructure of the gem. This characteristic makes it, and very rare, also very beautiful. 

Red Beryl

  Also known as "red emerald," a name more marketer today is better known as red beryl. Although part of the same group of emerald, is considered much rarer than this. 
  Red beryl is found primarily in the Thomas Range in the mountains of Utah. Extracted from volcanic rocks under low pressure and high temperature, its price can reach $ 10,000 per carat. 
  How is hardly explored the conditions where it is found, some scientists say red beryl is 8,000 times rarer than rubies some good quality.

Serendibite

  Not to be confused with serandite, is a cyan colored stone that comes from Sri Lanka. It boasts an unusually complex formula consisting of calcium, magnesium, aluminum, silicon, boron and oxygen. So far there exist three faceted specimens of 0.35 carats, 0.55 carats and 0.56 carats. The first two were discovered by rare stone specialist D. P. Gunasekera and purchased by the late Prof. E. J. Gübelin of Switzerland. The larger of those two is shown to the left; the smaller was sold for about $14,300.00 per carat. The name comes from the old Arabic term for Sri Lanka, Serendib, as referenced in The Sixth Voyage of Sinbad and elsewhere.

Blue Garnet

  Garnets species are found in many colors including red, orange, yellow, green, blue, purple, brown, black, pink and colorless. The rarest of these is the blue garnet, discovered in the late 1990s in Bekily, Madagascar. It is also found in various parts of the United States, Russia and Turkey. It changes color from blue-green to purple during the day with incandescent light, as a result of the relatively high amounts of vanadium.


Grandidierite

  Is an extremely rare mineral and gem that was first discovered in 1902 in southern Madagascar. The mineral was named in honor of French explorer Alfred Grandidier (1836–1912) who studied the natural history of Madagascar.

Source: http://discoverybrasil.uol.com.br

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