A blue diamond is a real, natural diamond with a noticeable blue tone due to the presence of boron in the diamond’s carbon structure. Blue diamonds range in color. From light blue to deep blue often with a secondary hue like violet, gray, and even green. Blue diamonds are not treated or enhanced to get their color, they are found in the earth’s surface with their natural blue coloring.

Blue diamonds are found only in a few mines in the world: the Argyle Mine in Australia, the Goloconda mine in India, and the Cullinan mine in South Africa. The carat weight and intensity of blue color determine how much a blue diamond is worth. Due to blue diamonds’ rarity, they’re usually more expensive than white diamonds and other color diamond.

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Most blue diamonds are Type IIb diamonds, which account for only 0.1% of the world’s color diamonds. There’s a spectrum within blue diamonds. These Diamonds range from light to deep, vivid blue. Most diamonds also have a secondary hue that alters their color to be more green or gray.

Depending on the color intensity, blue diamonds look like pale blue gemstones, vibrant blue stones or a mix of two colors like blue and purple. Secondary hues add tint and character to the stone. No matter where a stone falls on the blue diamond color chart, it’s bound to be a stunning, rare gem.

Blue diamonds belong to the family of Fancy Color Diamonds, the name for diamonds that exhibit a rich color. A blue diamond’s value is based on its 4Cs (Cut, Color, Clarity and Carat), with Color intensity being the most important factor.


Blue diamonds are real, natural diamonds that form beneath the surface for billions of years. These diamonds are not color-treated or enhanced to get their blue color—it is natural. The mesmerizing color of the blue diamond comes from traces of boron in the diamond’s carbon composition.

Though often confused, sapphires are entirely different gemstones than blue diamonds. Sapphires are a member of the corundum family and contain traces of titanium, iron, magnesium, copper and chromium.