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10. Tanzanite - US $1,200 per Carat

It is one of the proper gem stones with-inside the global due to its colorful and lovely blue shade. The deeper the blue colour is because of lines of element, Vanadium. The deeper the blue hue, the steeply-priced the gemstone is. 

9. Red Beryl - $10,000 per Carat

It is one of the rarest gems, and its been researched that for each 1,50,000 gem-excellent diamonds on earth, most effective one crystal of Red Beryl is found. The vibrant pink hue of the stone is because of the presence of an element, manganese.

8. Black Opal - $15,000 per Carat

It is an extraordinary gemstone, and because the call may suggest, its miles black, however it isn't always so. It has a herbal backing to them called “Potch”, because of which they get dark-hued appearance. The fundamental factor in Black Opal is silica, because of the rainbow.

 7. Taaffeite - Us $35,000 per Carat

It is one of the maximum lovely and exclusive gems, extensively famous due to the fact it's so uncommon and resembles spinel in shadeation. Even after some years of its discovery, only one samples had been recognized to be discovered.

6. Alexandrite - US $70,000 per Carat

Being so wonderful and attractive, it is one of the rarest and steeply-priced stones. Natural Alexandrite is more expensive than Ruby, Sapphire, Emerald and is discovered rarer than diamonds. 

5. Emerald - US $305,000 per Carat

The vibrant, inexperienced shadeation makes this Emerald famous and has been popular considering the fact that historic times. It is crafted from the mineral beryl. The elements is due to the presence of Chromium and Vanadium.

 4. Ruby - $1.8 million per Carat

Ruby is a symbol of power, beauty, wisdom and protection. The major countries for ruby mining and production are Sri Lanka, India, Madagascar and Thailand. The most expensive ruby in history is the Hople Ruby, which sold for $6.74 million.

3. Pink Diamonds - $1.9 million per carat

Pink diamonds, a breathtaking natural gemstone, are rare and valuable. Although colored for a variety of diamond, pink diamonds have no known evidence of why they are such an elegant color.

2. Jadeite - $3 million per carat

Jadeite is a beautiful, naturally occurring gem used to make tools, weapons, art and sculptures in gem-making and prehistoric times.

1. Blue Diamonds - $3.93 million per carat

Blue diamonds are rare, naturally occurring and considered the most valuable type of diamond. The bright blue color is mainly due to the element boron and the color intensity is due to the element nitrogen.