The most expensive gemstones in the world are colored diamonds. Not only are they rare, but they are also
known to have a spectacular brilliance and are the hardest substance found on earth. Out of all other gemstones,
they are arguably the most popular among people;
and also the most advertised and romanticized. Its wide spectrum of colors includes black, blue, champagne, chocolate/brown, cognac, green, pink, red and yellow. Its value is at an entirely different level that costs a fortune.
Nearing the top of the list is Musgravite, an extremely rare gemstone in the taaffeite family.
The mineral was first discovered at the Musgrave Range (thus its name) in South Australia.
It has shown up in other areas such as Antarctica, Greenland, and Madagascar but in highly limited quantities.
The first sizable gem-quality Musgravite specimen was found in 1993. It was the first one that is large and pure enough to be cut and shaped. As of 2005, there are only 8 known specimens of this stone to exist.
Alexandrite is a very rare (and very hard to acquire) gemstone variety.
It is popular for its remarkable optical properties: it undergoes dramatic color shifts depending on the lighting condition. This is caused by the rare combination of minerals including chromium, iron, and titanium. It is strongly pleochroic which means it changes color as you rotate it in your hand. But furthermore, it also changes colors independently of your viewing angle under an artificial light source.
It is greenish blue under natural light and then becomes reddish purple in soft, incandescent light. The Alexandrite was discovered in Russia’s Ural Mountains during the 1830s and named by Count Lev Alekseevich Perovskii in honor of Alexander II, the then-future Czar of Russia, in 1834.
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