9 Rarest Types of Diamonds in the World

In general, diamonds are considered pretty rare and are some of the most highly sought after gemstones in the world. However, lower quality diamonds are fairly common and are pretty accessible to nearly anyone. On the other end of the spectrum are the exceptional diamonds, which did not come around very often and can fetch tens of millions of dollars at auction. These highly valuable diamonds are always one or more of the rare types of diamonds on this list. Diamonds can be rare because of their color and/or their type, which is based on the level and type of chemical impurities present in the stone. Overall, naturally colored diamonds are very rare and they only comprise 0.01% (across all colors) of the total diamonds mined around the world.

Type IIa Diamonds

While Type IIa diamonds are the least rare of all rare diamond types, they are the most valuable. Type IIa diamonds contain highly pure carbon and are considered the “purest” diamonds out there. Typically Type IIa diamonds are almost entirely devoid of impurities and can be colorless, yellow, pink, purple, or brown. Type IIa diamonds take longer to form, which contributes to their exceptional quality. In general, Type IIa diamonds are very expensive, and some of the most notable examples are worth tens of millions of dollars or are even considered priceless. Percentage of Total Diamonds Mined: 1 to 2%

Type IIb Diamonds

Just after Type Ib diamonds, Type IIb diamonds are the next rarest of the four main types of diamonds. Type IIb diamonds have no nitrogen in them like the other three types of diamonds, but they do have high amounts of boron. Because of this, all blue and gray diamonds are classified as Type IIb. Since Type IIb diamonds are typically blue, gray, or a combination of those colors, they are highly valuable. Many famous Type IIb diamonds are worth tens of millions, but lesser examples can be purchased for a few thousand. Percentage of Total Diamonds Mined: about 0.1%

Type Ib Diamonds

Generally speaking, diamonds are classified by the level and type of their chemical impurities. The system has four basic types: Type Ia, Type Ib, Type IIa, and Type IIb. About 98% of diamonds are Type Ia, the most common and the other three types make up the remainder of all diamonds mined, making these types significantly rare. Of the four types, Type Ib is the rarest, with less than 0.1% of diamonds receiving this classification. Type Ib diamonds contain scattered nitrogen atoms, which usually results in a yellow, brown, or orange hue. Percentage of Total Diamonds Mined: less than 0.1%

Green Diamonds

Of all the rare natural colored diamonds, green diamonds are the least rare, but pure green diamonds hardly ever go up for sale. In fact, there are only two notable examples of pure naturally colored green diamonds: the famed Dresden Green and the more recent, Aurora Green. The Dresden Green is priceless while the Aurora Green was set into a ring that was sold for $16.2 million in 2016. Most natural green diamonds have a color that only resides on the surface, rather than having the color evenly distributed through the stone. This makes shaping green diamonds very difficult since the sparse coloring needs to be preserved. Percentage of Total Diamonds Mined: Unspecified – less than 0.001%

Orange Diamonds

Since the color orange is a combination of yellow and red, pure orange diamonds – which would have just the right amounts of yellow, red, and other secondary tones – are very difficult to find. However, overall, orange diamonds are not as rare as red, blue, pink, and purple diamonds. Diamonds with orange tints pop up fairly frequently, but the Gemological Institute of America rarely ever grades a stone as being pure orange. Orange diamonds get their color from the presence of nitrogen, which is what also makes yellow diamonds yellow. Usually, orange diamonds have either a brown, yellow, or pink overtone, with the orange hue being the stone’s secondary color. Any diamond with less than 25 percent orange tones, is labeled as “orangy.” Percentage of Total Diamonds Mined: Unspecified – less than 0.001%

Purple Diamonds

In general pure purple diamonds are very rare, but since purple diamonds tend to have secondary hues and overtone colors, purple diamonds aren’t considered quite as rare as pink, blue, and red diamonds. In fact, many purple diamonds have a pinkish, blueish, grayish, and even red tone to them. While secondary colors typically cause a diamond to lose value, overall, purple diamonds are quite expensive, and often sell for a few tens of thousands of dollars and upwards of a few million. Purple diamonds mostly come from the Argyle Mine, Siberia, Russia, Brazil, and sometimes Canada. Percentage of Total Diamonds Mined: Unspecified – less than 0.01%

Pink Diamonds

Of all the naturally colored diamonds, the pink diamond is the most desirable because of its beautiful rosy hue and its association with female celebrities and royalty. Because pink diamonds are in such high demand, high quality examples and larger carats can fetch very high prices. Some pink diamonds have been sold for tens of millions of dollars, while some like the Daria-i-Noor and Noor-ul-Ain, both Iranian crown jewels, are essentially priceless. Like most of the world’s naturally colored diamonds, a majority of pink diamonds come from the Argyle Mine in Western Australia. Pink diamonds are also found in Brazil, Russia, Siberia, South Africa, Tanzania, and even Canada. Percentage of Total Diamonds Mined: Unspecified – less than 0.01%

Blue Diamonds

Just behind red diamonds in rarity, are blue diamonds, which are actually more valuable than reds because of demand. While blue diamonds are the second rarest type of diamond, there have been many notable examples, including the famed Hope Diamond, which is reportedly cursed due to the number of deaths associated with the diamond. Blue diamonds receive their color from trace amounts of boron found in the diamond’s crystal lattice structure. A majority of the world’s blue diamonds come from India, followed by South Africa, Western Australia, and recently in Botswana. Percentage of Total Diamonds Mined: Unspecified – less than 0.01%

Red Diamonds

Of all the different types of diamonds out there, red diamonds are the rarest diamonds in the world. Natural pure red diamonds are so rare that less than 30 examples have ever been found. Due to the extreme rarity of red diamonds, they are typically worth hundreds of thousands of dollars per carat. For example, the famous Hancock Red, the first known example of a red diamond, was sold for $880,000 in 1987, which was about $926,000 per carat! In addition to the rarity, red diamonds are also pretty mysterious. Despite decades of research, no one is quite sure how red diamonds acquired their color. The leading theory is that red diamonds are actually really dark pink diamonds that experienced a plastic deformation in its crystal lattice structure, causing humans to see red instead of pink. Percentage of Total Diamonds Mined: Less than 30 known examples of pure red diamonds ever found

This article originally appeared on Rarest.org.

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