5.76 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This loose sapphire from The Natural Sapphire Company is a transparent, GGTL certified Blue 5.76 carat oval sapphire, with measured dimensions of 11.71 x 9.99 x 6.18 mm, a mixed brilliant cut, an eye clean clarity grade when evaluated at eye level, vivid color intensity, and an excellent polish. The stone is from Ceylon, Sri Lanka, and has been heat treated to enhance color and clarity, a stable and widely accepted enhancement for corundum. The oval outline presents a length to width ratio of approximately 1.17, yielding a slightly broad, elegant silhouette that sits well in both classic and contemporary settings. The depth of 6.18 mm produces a depth percentage of about 57, a proportion that balances color saturation with optimal light return for the mixed brilliant faceting strategy employed by the cutter. The GGTL report accompanies the gem to document origin, enhancement, and the key gemological observations that underpin valuation and care recommendations.

The faceting and cutting approach is intentional and technically informed, the mixed brilliant style combining a brilliant facet arrangement on the crown with carefully articulated pavilion facets to marry scintillation and color. On the crown, a well proportioned table and guard facets channel light into the pavilion, while the pavilion facets have been calibrated to avoid excessive light leakage, producing a lively yet controlled play of light. The cutter achieved even facet junctions and facet symmetry that support the stone s vivid color without creating windowing or dead areas, and the excellent polish amplifies surface reflectivity so that facet contrast remains crisp. The mixed brilliant approach is especially advantageous for a Ceylon sapphire of this size and hue, because it permits the stone to demonstrate both internal depth of color and dynamic brilliance on the surface, qualities that are often at odds in single minded cuts.

Color and clarity define much of this sapphire s aesthetic and market appeal, the vivid intensity indicating strong saturation with a mid to medium deep tone that reads as quintessential blue in a variety of lighting conditions. Ceylon sapphires are known for their lively, almost electric blue spectrum, and this stone exhibits that heritage while maintaining a pure blue hue with minimal secondary modifiers. Eye clean clarity at normal viewing distance elevates the gem s transparency, allowing the mixed brilliant faceting to produce open windows of color and clean flashes rather than obscured or diffused light. From a gemological performance perspective, corundum s characteristic refractive index around 1.76 contributes to strong brilliance, and the inherent hardness of Mohs 9 secures the stone for everyday wearable designs with appropriate protective settings. Heat treatment performed on this sapphire is a standard, controlled process used to improve color uniformity and reduce silk or rutile inclusions, and when disclosed alongside a lab report such as the GGTL certificate it supports buyer confidence without diminishing the natural origin and structural integrity of the stone.

When placed in the context of historically famous sapphires, this Ceylon sapphire offers a complementary set of virtues rather than a simple comparison by size. The Logan Sapphire and the Stuart Sapphire are monumental examples that represent historical importance and museum scale, and the Star of India is celebrated for its extraordinary size and asterism as a cabochon. Those historic gems tell stories of provenance and spectacle, while this 5.76 carat oval from The Natural Sapphire Company articulates modern connoisseurship, where precise cutting, vivid saturation, and eye clean clarity command premium attention at collectible size. Unlike many older, large historic stones that were preserved as museum pieces or cut as cabochons to display phenomena, this mixed brilliant oval is optimized for personal wear and for setting designs that exploit faceted brilliance. The result is a gem that combines Ceylon s renowned color lineage with contemporary lapidary technique, producing a wearable, investment quality stone that reads as both a technical achievement and a gemstone with clear historical roots. For clients seeking a gem with verified origin, documented enhancement, and cutting proportions that favor both color and light return, this GGTL certified Ceylon blue sapphire represents a rare alignment of provenance, craftsmanship, and optical performance from The Natural Sapphire Company.