Top 10 Most Expensive And Rarest Gemstones In The World

Diamond is the most famous gemstone in the world, which most of us know is valuable both for its beauty and for its exceptional features, known as the 4 C. But there are other extremely precious gemstones, both because of their special qualities. , as well as rarity, being even considered some of the rarest gemstones in the world.

Gemstones are composed of a variety of minerals, rocks, and organic materials. To date, there are over 300 gemstones discovered, some of which are significantly rarer and more valuable than even the iconic diamond. Also, Read – What are Natural Stones, What are the Properties of Natural Stones?

One of the most valuable gemstones in the world is the unusual and rare crystal due to its rich color, luster, and physical properties. These extremely rare gemstones are in high demand by museums and collectors, all of which are priced according to their rarity and value.

We, therefore, present 10 of the most expensive precious stones in the world and also the rarest:

10. Taaffeite

The story of one of the rarest stones – Taaffeitul – is worthy of a movie script. In the 1940s, the Austro-Irish gemologist, Earl Edward Charles Richard Taaffe, bought a box of cut stones from a jeweler in Dublin, believing that he had bought a collection of spinels. But on closer inspection, he noticed that one of the pale purple stones did not react to the light in the same way as the rest of the spinels, so he sent it to specialists for analysis. The results revealed that he had discovered a gemstone hitherto unknown – a unique but frustrating situation because he had no idea where this mineral could come from nature.


Fortunately, once the new stone was announced, many other collectors re-examined their own spinel collections and found a number of other Taaffeite stones. Eventually, the source of the stone was found in Sri Lanka, although a few were also found in Tanzania and China. It is believed that there are less than 50 examples of Taaffeite worldwide – many of which are part of private geological collections. Unlike spinel, taaffeite has the property of double refraction, which allows the distinction between these two minerals.

9. Jadeite

Often known as jade, jadeite is the official stone of British Columbia, a region where it is found in large deposits. Jade is the purest, rarest, and most beautiful gemstone in the jade family. It has a Mohs hardness of about 6.5 to 7.0, depending on the composition. The “Hutton-Midivani Necklace”, made up of 27 high-quality large jadeite beads, sold for over $ 27 million.


8. Grandidierite

One of the rarest stones in the world is grandidierite. Grandidierite is a mineral originally discovered in southern Madagascar in 1902. The mineral was named in honor of the French explorer Alfred Grandidier (1836–1912) who studied the natural history of Madagascar.


The more iron (Fe) it contains, the bluer the grandidierite. Grandidierite has a strong pleochroism. This means that depending on the viewing angle, the stone can display three different colors: dark blue-green, colorless (sometimes very light yellow), or dark green.

7. Alexandrite

Alexandrite is a variety of the chrysoberyl mineral discovered in 1834 about 100 km from the Russian city of Ekaterinburg. This rare stone was named in honor of Russian Tsar Alexander II, quickly becoming one of the most precious stones of the Russian aristocracy.


Alexandrite has a color change depending on the nature of the ambient lighting, called metamerism. Metamerism is the phenomenon of a color change from greenish to reddish, depending on the light source. Due to its rarity, but also its changeable beauty, even the smallest natural alexandrite stones are worth thousands of euros. Being a rare stone, the extraction of alexandrite has always been controlled. Also, Read – Natural Stones and Properties by Zodiac Sign

6. Emerald

Emerald is the most precious stone in the beryl mineral family. It is also known as the “stone of kings”, being appreciated by the crowned heads due to its supposed mystical properties such as the development of intelligence, wisdom, and creativity. Emerald has a Mohs hardness of 7.5 to 8, considered by jewelers to be a very good hardness to be used in creating jewelry. However, most emeralds contain numerous inclusions or surface fractures, specific characteristics of the emerald.


One of the most famous and expensive emeralds in the world is the chalk emerald, which weighs 37.8 carats. It ranks among the most beautiful emeralds that have been discovered, due to its remarkable clarity and green color, richly velvety. It initially weighed 38.4 carats but was cut and placed in a platinum and gold ring designed by Harry Winston Inc., where it is surrounded by 60 diamonds.

5. Tanzanite

Tanzanite is a beautiful blue variety of the mineral zoisite and is so named because it is found only in a small area near the foot of Mount Kilimanjaro in Tanzania. The stone was not discovered in commercial quantities until the 1960s, and since then its popularity has grown enormously. Heat treatment of tanzanite at very high temperatures can improve the blue color, so most of the stones on the market have been treated this way, but any tanzanite that has not been heat-treated and has a strong blue color naturally will have a value much bigger.


Because it is found in only one location, the value of tanzanite seems to increase over time; once these mines are emptied, no new stones will appear on the market – unless a new source is found. The largest faceted tanzanite in the world is 737.81 carats. One of the most famous tanzanite crystals, called the Queen of Kilimanjaro, has 242 carats.

4. Musgrave

One of the most precious gemstones, apart from diamond, is the musgravite. It is an extremely rare gemstone from the Taafite family, first discovered in South Australia. It is also found in other areas, such as Antarctica, Greenland, and Madagascar, but in very small quantities. Also, Read – Color Of Precious Stones, Semi-precious Stones & Jewellery


3. Red Beryllium

Red beryllium is a mineral that is colorless in nature, but which changes color once it comes in contact with air and daylight. This gemstone can be worth up to $ 10,000 per carat and such minerals with more than 2-3 carats are rarely found.

Red Beryllium

2. Black Opal

Black opal is one of the stones that has conquered the world of jewelry forever due to its special elegance and refinement. But what many do not know is that black opal is the most valuable form of opal. High quality black opal can be priced up to $ 15,000 per carat.

Black opal

Unlike the usual forms of opal, black opal has trace elements of carbon and iron oxide, which cause the unusual darkness of the stone. Due to the dark tone of the body, the colors of the rainbow in a black opal are much better distinguished than the lighter opals. Also, Read – Top 10 most expensive antiques in the world

1. Blue Diamond

The blue diamond is a type of diamond that has all the characteristics of a classic diamond, except for the additional element: the color blue. This color was obtained due to the boron that influences the structure of the crystal lattice. Blue diamonds belong to a subcategory of diamonds called fancy diamonds, a generic name for diamonds that have an intense color. Also, Read – Black Diamond: Properties, Carat, Colour, Sizes & Shapes

Blue Diamond

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