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Fancy Blue Natural Diamonds
Fancy blue diamonds owe their colour to boron, which also makes them electrically conductive — a quirk unique among diamonds. The Hope Diamond is the most famous example.
Natural blues are among the rarest colours on earth; lab-grown blues offer the same optical effect at an entirely different price. These are natural stones, formed over billions of years and mined under traceable, conflict-free supply chains. Read what makes a diamond ethical before you choose. Colour is graded on its own scale for fancy diamonds rather than the D-to-Z scale — our diamond 4Cs guide explains how that works, and our diamond shapes guide shows how each outline carries colour differently. Every stone is independently certified, priced transparently, and can be set into any ring in our collection or into a design of your own.
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