Some of the most expensive fine jewelry is made from rare diamonds. A naturally occurring diamond can take up to 3 billion years to form, making them extremely precious. While all diamonds are unique, certain forms of diamonds are especially uncommon. In general, colored diamonds are very sparse, red diamonds being the rarest of them all. In terms of formations, Type IIa is the rarest form of diamond followed by the Type Ib. Here’s a detailed breakdown of the rarest kinds of diamonds in the world.

Colored Diamonds

One of the lesser known facts about diamonds is that they come in a variety of colors ranging from faintest of pinks to the deepest black. Colored diamonds comprise of only 0.01% of the total diamonds mined worldwide. Their rarity makes them immensely valuable. Yellow, brown, and black diamonds are more readily available of all the colored diamonds.

Red Diamonds

Red diamonds are the rarest and some of the most expensive in the world. Also known as Fancy Reds, they come in a variety of shades ranging from orange-red to brownish red. Majority of the world’s red diamonds come from the Argyle Diamond Mine in Australia. The below 5.11-carat, Moussaieff Red Diamond is the largest IF graded fancy red diamond in the world.


The Moussaieff Red Diamond | Image Courtesy: Geology In

Blue Diamonds

Arguably, fancy blue diamonds are the second rarest diamonds on the market. Comprising only 1% of all the mined colored diamonds in the world, blue diamonds are often associated with royalty. The color grading ranges from a very faint blue to a fancy vivid blue. The below grayish-blue 45.52-carat Hope Diamond is one of the most blue diamonds in the world.WORLD’S RAREST DIAMONDS (2)

The Hope Diamond | Image courtesy: Colored Diamondsand Royal Design Fine Jewelry

Green Diamonds

Also on the rarity list are fancy green diamonds. Due to the volume of artificially enhanced green diamonds on the market, ascertaining its natural color is key to determining its value. The Dresden Green Diamond is one of the most popular green diamonds in the world. Pictured below, The green diamond is set in a military hat ornament designed by Franz Michael Diespach.WORLD’S RAREST DIAMONDS (3)

The Dresden Green Diamond |The Metand Coster Diamond

Orange Diamonds

Pure orange diamonds are extremely rare. Yellowish orange diamonds are easier to find. They range from dim yellowish orange to fancy vivid orange. Due to comparatively lower market demand, the stunning fancy oranges are more of an collector’s item. The 5.54-carat Pumpkin is one of the most well known orange diamonds.


AFancy Vivid Yellow-Orange Diamond | Image Courtesy: Diamond Envy

Pink Diamonds

Romantic and feminine, pink diamonds are highly popular. While intense fancy pinks are extremely rare, faint pinks are more easily available. Over 90% of the world’s pink diamonds are produced by the Argyle Diamond Mine located in Australia. The below vivid pink colored 59.60-carat IF grade Pink Star, formerly known as the Steinmetz Pink is one of the most popular pink diamonds in the world.


The Pink Star | Image Courtesy: Ritani

The Rarest Types Of Diamonds


The Type IIa diamonds comprise only 1% of all the diamonds in the world. They are also sometimes called “Golconda Diamonds” named after the famous Golconda mine in India, which has historically produced many iconic Type IIa diamonds. They have no nitrogen impurities, as a result of which most of them are colorless. Most D flawless diamonds are of the Type IIa form. They can also be pink, gray, light blue, or light green. Of all the diamonds, they are considered to be the most chemically pure and are very expensive. Some of the world’s most famous and opulent diamonds have been cut from this type of rough diamond, such as the Elizabeth Taylor Diamond, The Graff Pink, and the Koh-i-noor, which still sits on the British crown.


The stunning Type IIa Elizabeth Taylor Diamond | Image Courtesy: Baunat

Type Ib and IIb

Supposedly less than 0.1% natural diamonds are Type Ib. These diamonds are usually intensely colored, including yellow, brown and orange diamonds. These warm toned beauties are extremely rare. Diamonds of this type are often classified as “canary” colored.

The IIb diamonds are also very rare and usually have a bluish tinge to them. They are also known to conduct electricity. These are highly valuable and many gray-bluish diamonds are of this form.

Type Ia: The Most Common Type of Diamond

The Type Ia are the most commonly occurringdiamond type, comprising around 98% of mined diamonds in the world. Many of them exhibit blue fluorescence. Since these types of diamonds absorb blue light, their color ranges from near colorless to pale yellow. They can further be divided into Type IaA and Type IaB. The nitrogen atoms in type Type IaA occur in pairs and thus do not affect the diamond’s color. In Type IaB, however, the nitrogen atoms appear in larger aggregates, imparting a yellowing/brownish tinge to the gemstone.

Irrespective of their rarity, diamonds are exquisitely stunning and extremely precious.

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What is the rarest diamond on Earth? ›

5 World's Rarest Diamonds
  1. Koh-i-Noor. Koh-i-Noor is one of the rarest diamonds on Earth. ...
  2. The Cullinan. The Cullinan diamond is one of the rarest and most valuable diamonds in the world. ...
  3. The Hope. ...
  4. De Beers Centenary. ...
  5. The Pink Star Diamond.

What is the number 1 expensive diamond in the world? ›

Kohinoor Diamond

Kohinoor, often written Koh-i-Nur, is the most expensive diamond in the world. The diamond, also known as the Mountain of Light diamond, weighs an incredible 105.6 carats and is one of the largest cut diamonds ever discovered. The colorless Kohinoor diamond has an oval brilliant cut.

Which is rarer, a blue or pink diamond? ›

The most expensive and largest pink diamond in the world—The Pink Star—has 59.6 carats. It was sold for USD$72.2 million, or $USD1. 3 million per carat. In terms of rarity, blue diamonds are believed to be no rarer than pink or Argyle diamonds.

What is the most valuable color of diamonds? ›

Red diamonds are the most expensive colored diamonds. Currently, only about 20 to 30 exist in the world. These diamonds derive their red shade during the mining formation. The process is uncommon, explaining why red diamonds are rare and extremely small in size.

What is 1000x rarer than diamond? ›

Tanzanite is a shocking 1000 times more rare than a diamond.

Who owns the most expensive diamond? ›

All diamonds now belong to the Crown Jewels of the United Kingdom. The Cullinan I weighs 530.2 carats and Cullinan II weighs 317.4 carats. The Cullinan II, also called The Star of Africa, is worth about $400 million and is the largest polished white diamond in the world.

How rare is a rainbow diamond? ›

Seen in practically every color of the rainbow, colored diamonds are far rarer than diamonds in the D-to-Z color range. Only one out of 10,000 carats of fashioned diamonds displays fancy color, and a diamond's chances of displaying intense color are even less – one in 25,000.

Is black diamond real? ›

Yes! Black diamonds are real diamonds. Natural diamonds, Carbonados, and treated black diamonds are all found in nature. Unlike natural diamonds and Carbonados, treated black diamonds aren't naturally black, they're treated with heat to get their color.

What gem is rarer than diamond? ›


The Guinness Book of World Records claimed that in 2005, painite was the rarest gemstone in the world, even rarer than diamonds. The color can vary anywhere from pink to reddish, and even brown in color, but can even appear green under certain lighting.

How much is Meghan Markle's ring worth? ›

It is believed that Meghan Markle's engagement ring cost Prince Harry around 305,000 Euros. This equates to around $350,000 US. Which is better for an engagement ring - cushion or round cut? Overall, the shape of the stone in your engagement ring depends on personal preference.

How valuable are black diamonds? ›

Lab grown black diamonds cost about $200-$400 a carat and are significantly less expensive than their naturally found counterparts, which are extremely rare and valuable. Natural black diamonds cost about $3000 to $5000 per carat, depending upon size and quality.

What are the three rarest diamonds? ›

What Are the Rarest Diamond Colors?
  • Red Diamonds. The rarest of all colored diamonds, only 20 to 30 natural red diamonds exist in the entire world. ...
  • Blue Diamonds. Also incredibly rare are blue diamonds, which have only been found naturally in mines in South Africa, India, and Australia. ...
  • Pink Diamonds. ...
  • Yellow Diamonds.
Oct 30, 2021

Who owns the Hope Diamond? ›

The Hope Diamond is currently housed in the National Gem and Mineral collection at the National Museum of Natural History in Washington, D.C. It has changed hands numerous times on its way from Hyderabad, India, to France, Great Britain, and the United States, where it is on public display.

Has anyone found the diamond from the Titanic? ›

Unfortunately, much like Jack and Rose's timeless romance, the Heart of the Ocean necklace is fictional. However, that doesn't mean there aren't any blue diamonds out there, and one diamond in particular — The Hope Diamond — is thought to have directly inspired Rose's necklace in Titanic.

How much are blood diamonds worth? ›

The cost of blood diamonds starts from $50,000 to $100 million per carat. The price of these diamonds depends on their rarity, clarity, carat weights, color spectrum, and original formation.

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