“Ocean Dream” Blue-Green Diamond
Estimate: CHF 7–10 million
A 5.50-carat triangular-cut blue-green diamond, certified by the GIA as Fancy Vivid Blue-Green in color and SI1 in clarity; classified as a Type Ia diamond.
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Blue diamonds, renowned for their extreme rarity and deep-mantle origin, have historically symbolized royalty and mystery, with the 17th-century Indian Kollur mine-sourced Hope Diamond being the most iconic example. Unlike yellow diamonds, their color comes from boron, and they form 400+ miles below the surface, often containing clues to ancient, subducted oceanic crust.Earliest History: The first recorded blue diamonds appeared in the 17th century, notably the 112-carat diamond purchased by Jean Baptiste Tavernier in India, later acquired by King Louis XIV as the French Blue in 1668.Famous Pieces: The Hope Diamond (re-cut from the French Blue) and the Wittelsbach-Graff (dating to 1673 in the Hapsburg court) are the most famous historic examples.Geological Origin: Blue diamonds are unique in that their boron-driven color forms at extreme depths, usually in subducted ocean floor, separating them from other diamonds that form under continental cratons.Modern Sources: Historically, India and Brazil were primary sources, but today, they are primarily found in South Africa’s Cullinan Mine and sporadically in the now-closed Argyle Mine in Australia.Value and Rarity: Making up less than 0.02% of all mined diamonds, blue diamonds are considered among the rarest in the world, with their value determined by the intensity of the blue hue.
