What Color Diamond Is The Most Expensive?

What Color Diamond Is The Most Expensive?

At Wm. Harold & Sons, we delve into the fascinating world of colored diamonds, revealing why certain hues command extraordinary prices. Beyond the classic sparkle of colorless diamonds lies a spectrum of colored gems, each with its own story of beauty and rarity. This guide highlights the most expensive diamond color, showcasing the unique allure and value of these exceptional stones.

The Rarity and Value of Colored Diamonds

Colored diamonds, also known as fancy color diamonds, owe their hues to specific conditions and elements present during their formation. The presence of nitrogen can create yellow diamonds, while boron can result in blue diamonds. Structural anomalies during formation can lead to pink or red diamonds. The rarity of these colors, along with the intensity and purity of the hue, significantly influences their value.

The Most Expensive Diamond Color: Red

Rarity and Demand

Red diamonds are the rarest and, by extension, the most expensive color diamonds in the world. Their extraordinary color comes from a rare deformation in the diamond's atomic structure, and unlike other colored diamonds, there are no impurities like nitrogen or boron that contribute to their color. The exact cause of the red coloration is still a subject of scientific study, adding to their mystique and allure.

Notable Red Diamonds

One of the most famous red diamonds is the Moussaieff Red, a 5.11-carat diamond with a rich, deep red color. Given its rarity and exceptional quality, the value of the Moussaieff Red and other red diamonds can reach millions of dollars per carat, setting them apart in the diamond market.

Other Expensive Diamond Colors

While red diamonds hold the title for the most expensive, several other fancy color diamonds also command high prices due to their rarity and beauty.

Blue Diamonds

Next to red, blue diamonds are highly prized for their stunning hues and rarity. The Hope Diamond is perhaps the most famous example, known for its deep blue color and fascinating history. The presence of boron causes the blue color, and the value of blue diamonds increases with the intensity of the hue.

Pink Diamonds

Pink diamonds, with their romantic and delicate color, are another rare and expensive category. The Argyle Mine in Australia, a primary source of pink diamonds, has significantly contributed to their rarity by producing a limited quantity of these gems before its closure. The unique coloration of pink diamonds, thought to be caused by intense pressure during their formation, can make them exceptionally costly.

Factors Influencing the Price of Colored Diamonds

The value of colored diamonds is determined by a combination of factors, including:

  • Intensity and Purity of Color- The more intense and pure the color, the higher the diamond's value.
  • Rarity- The rarer the color, the more expensive the diamond tends to be.
  • Size and Quality- Larger diamonds and those with fewer inclusions are more valuable, especially when they also exhibit rare colors.


Red diamonds, with their unmatched rarity, stand as the most prized and expensive. However, the allure of colored diamonds encompasses a variety of hues, each prized for its unique beauty and rarity. At Wm. Harold & Sons, we're committed to guiding you to the perfect colored diamond, a gem that not only captures the eye but also embodies the depth of your sentiments. Discover with us the colored diamond that marks your special moments with unmatched luxury and exclusivity.