Blue diamonds are a type of fancy color diamond that are highly prized for their rare and striking color. Blue diamonds get their color from the presence of boron, which is a chemical impurity in the diamond's crystal structure that causes the absorption of certain wavelengths of light, resulting in the blue color.
Blue diamonds come in a range of shades, from faint blue to deep blue, with the more intense shades being the most valuable. Learn about all the shades and intensities of blue diamonds here.
Blue diamonds are often the most expensive jewel sold in auction houses such as Sotheby's and Christie's. The most famous blue diamond in the world is the Hope Diamond, which is a deep blue diamond weighing 45.52 carats and is estimated to be worth over $250 million. Other notable blue diamonds include the Blue Moon of Josephine, a 12.03-carat diamond that sold for $48.5 million in 2015, and the Oppenheimer Blue, a 14.62-carat diamond that sold for over $57 million in 2016.
Blue diamonds are primarily found in mines in South Africa and India, and they are among the rarest of all fancy color diamonds, accounting for less than 0.1% of all diamonds mined worldwide. This rarity, combined with their unique beauty and cultural significance, makes blue diamonds highly coveted by collectors and investors alike, with prices often reaching millions of dollars at auction.