While the term “cornflower blue” is more descriptive than scientifically precise, it is extremely rare to find a sapphire of pure blue, so these are particularly prized. Sapphires generally have undertones of green or purple, while a cornflower blue sapphire is said to be closer to “true” blue, along with excellent tone and saturation to highlight the purity of the color. The cornflower is one of the few flowers that is purely blue, rather than violet or purple, so a cornflower blue sapphire is a gemstone with a color similar to the intense blue color of a cornflower.
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