15.09 Ct. Bluish Green Sapphire from Madagascar

There are gemstones that arrive fully formed into the imagination, and then there are those that announce themselves by the story of their origin. This exceptionally rare bluish green sapphire began its life deep beneath the weathered hills of Madagascar, where ancient geological forces concentrated elements into a crystal as old as the earth itself. In small, carefully managed artisanal workings a single parcel of rough revealed a stone with extraordinary depth and saturation, a crystal that seemed to hold forest and lagoon and midnight sky in its heart. Our local partners in Madagascar recognized the potential immediately, and after responsible extraction the rough was transported with meticulous chain of custody documentation to an independent laboratory. The stone you see now carries a C.Dunaigre certification, a testament to provenance and authenticity that accompanies this gem from its mine to its new home. Few pieces present such a complete narrative, and even fewer preserve the rare bluish green hue with such clarity, making this sapphire not simply a purchase, but an entry into an exclusive lineage of collectors and connoisseurs.

The transformation from rough to the 15.09 carat masterpiece in your hands is a story of precision and artistry. Our master cutter chose an asscher cut in an octagon form to honor the natural crystal symmetry while maximizing face up color and brilliance. The finished proportions measure 13.63 by 12.72 by 9.61 millimeters, dimensions that bestow an imposing presence while remaining perfectly suited to a bespoke ring or pendant. Evaluated at eye level, the clarity is graded very very slightly included, a level of purity that permits the vivid bluish green color intensity to sing without distraction, and the polish is excellent, reflecting light with an almost mirror like finish. This stone has been heat treated, a time honored and widely accepted enhancement that stabilizes and enriches the color, never concealing the gem’s inherent quality. Each facet was cut with intention, to create internal pathways for light to travel, to awaken the sapphire’s depth, and to ensure that every tilt of the head reveals a new facet of its personality.

Possession of a gem with this combination of weight, hue, cut, and documentation confers a particular kind of exclusivity. At 15.09 carats, this bluish green sapphire occupies a very narrow band of the market where collector demand far exceeds supply, especially when paired with vivid color intensity and a C.Dunaigre certificate confirming origin and treatments. The asscher octagon silhouette gives it an architectural elegance, timeless and yet boldly modern, making it a conversation piece for those who appreciate quiet power and refined rarity. When mounted in a custom setting, the stone commands attention without shouting, it flatters a hand while asserting a distinguished identity in any room. The very very slightly included clarity means that under normal viewing conditions the gem appears pure and vivid, and the excellent polish ensures surfaces glow rather than graze, elevating the overall visual impact. For the discriminating buyer, this sapphire is less a commodity and more a private commission from the earth, available to only a fortunate few who value provenance, craftsmanship, and singular beauty.

At The Natural Sapphire Company we curate these moments of encounter between collector and gem with attentive care, and this exceptional Malagasy sapphire is offered as part of our bespoke experience. We accompany every gem with full details of origin, the independent C.Dunaigre certification, and our own photographic documentation, so that ownership begins with confidence and continues with pleasure. For the client who desires a made to measure setting, our designers will propose configurations that respect the asscher octagon geometry, that enhance the vivid bluish green heart of the stone, and that preserve the integrity of the 13.63 by 12.72 by 9.61 millimeter proportions. We also provide guidance on ring shank profiles and bezel versus prong settings, to balance wearability with the drama of display. We invite those who understand the value of true rarity to contact us for a private consultation, to see the stone in person, and to discuss a bespoke commission. Owning this sapphire is to join a very small circle of connoisseurs who appreciate not only the beauty of a gem, but the responsible story of its origin, the skill of its cut, and the assurance of certified authenticity.