5.91 Ct. Blue Sapphire from Ceylon (Sri Lanka)

From the moment this sapphire first revealed itself in the alluvial gravels of Ceylon, it carried the story of an island renowned for producing some of the world’s most beguiling blue gems. Carved by time and the slow work of river and earth, the rough was discovered by hands who know the land and its secrets, and then traveled through a network of trusted experts to meet the cutters and gemologists at The Natural Sapphire Company. Our lapidaries found in that rough the promise of a classic oval form, and with patient planning and centuries of cutting tradition they brought forth a 5.91 carat oval sapphire, precisely measured at 10.80 by 9.10 by 7.21 millimeters, certified by GIA so that its natural origin and quality are documented and trusted. This is a Ceylon stone, heat treated in the standard, stable way to enhance and stabilize its beautiful color, and polished to an excellent finish that lets the gem speak with clarity and confidence.

As a narrative of craft, this sapphire’s story continues in the studio, where the mixed brilliant cut was chosen to harmonize the stone’s internal character with external brilliance, producing lively scintillation and a broad, velvety field of intense blue. Under magnification and at eye level the gem reads as very slightly included, which for collectors is often cherished as a fingerprint of natural formation, rather than an imperfection, and it contributes to the gem’s individuality. The facets were cut to emphasize both depth of color and light return, so that the intense color intensity remains vivid without appearing flat, while the excellent polish ensures smooth facets that reflect light cleanly. The final result is a sapphire that feels rooted in the history of Ceylon gemcraft, but refined to contemporary standards by The Natural Sapphire Company’s commitment to transparency, documentation, and artisanal skill.

Lighting transforms this Ceylon blue in subtle and sometimes dramatic ways, making it an exceptionally versatile gem for everyday wear or a treasured statement piece. In bright daylight, especially northern or cloudy daylight, the stone reads a pure, luminous cornflower to royal blue, the mixed brilliant cut dispersing light into a steady glow across the table, the intense saturation maintaining depth without overpowering the eye. In direct sunlight the sapphire flashes with lively scintillation, the facet junctions throwing crisp flashes of electric blue as the stone moves, while the pavilion depth creates occasional deeper, inky reflections that give the gem a three-dimensional richness. Under cool LED or studio lighting the blue takes on a crisp, almost electric clarity, revealing subtle violet or indigo tones at certain angles, a reminder of the pleochroic tendencies that make Ceylon sapphires so captivating. Warm incandescent light and candlelight deepen the hue toward a softer, more sensual blue, the brilliance becoming more restrained and the stone appearing velvety and luminous, ideal for evening settings. Because of the combination of the mixed brilliant cut and excellent polish, the sapphire also responds beautifully to different settings, appearing brighter set in white metals with a lighter, airier look, and richer framed by warm yellow gold, where the surrounding metal can gently warm the overall appearance while the gem’s intense color remains the focal point.

This is a gem for someone who appreciates provenance and personality, a piece that carries the island history of Sri Lanka and the exacting standards of modern gemology, and that performs with elegance under any light. The GIA certificate confirms the stone’s identity and treatments, while the very slightly included clarity and the precise dimensions make it an exceptional candidate for a solitaire ring, a refined halo setting, or a bespoke piece that highlights the oval’s graceful silhouette. At The Natural Sapphire Company we are proud to present gemstones with stories, and this 5.91 carat Ceylon blue sapphire is a chapter that begins in ancient soils and ends in a jewel that sings in daylight, dazzles in sunlight, and glows by lamplight. If you would like to see this stone in different settings or lighting, we can provide additional photographs and personalized guidance to help you imagine how it will become part of your own story.