3 Carat Marquise Cut Blue Diamonds

Boron atoms create blue. The marquise's elongated shape spreads blue across the largest face-up area of any shape. At 3 carats, deeply striking.

Among the rarest diamonds in existence. A 3 carat natural blue marquise maximizes this rare color across the most dramatic silhouette.

Yes, natural diamonds with this size, shape, and color combination are available from Do Amore, ethically sourced from Canada, recycled origins, or blockchain-verified conflict-free supply chains. Every diamond is certified by GIA, IGI, or GCAL. Every purchase funds clean water access for one person in need. All rings include free lifetime maintenance covering inspections, polishing, cleaning, stone tightening, rhodium plating, and resizing.

Lab growing allows more consistent blue coloring than nature. At 3 carats, the larger stone allows the blue hue to display with greater depth and saturation than in smaller stones. The marquise cut's brilliant-cut faceting in an elongated pointed shape distribute the color evenly across the face. Natural blue diamonds are extremely rare and highly prized, making them highly collectible.