6.57 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This is a rare and beautiful transparent C.Dunaigre certified Vivid Blue sapphire weighing 6.57 carats, presented in a cushion shape with a mixed brilliant cut and precise dimensions of 12.36 by 9.04 by 5.75 mm. The stone exhibits a vivid color intensity with an excellent polish, and it is graded as slightly included when evaluated at eye level. The origin is Ceylon, Sri Lanka, and the gem has undergone standard heat treatment, disclosed and stable, a common practice that enhances color and clarity while preserving the natural character of the crystal. As offered by The Natural Sapphire Company, this sapphire is accompanied by detailed documentation from C.Dunaigre, supporting its identification, origin attribution, and the nature of its enhancement, which matters to anyone purchasing with an eye for long term value and responsible disclosure.

From a gemological perspective the term vivid blue describes a strong, saturated hue with a lively tone that reads bright without appearing overly dark or inky. In this sapphire, the hue leans distinctly toward pure blue, with minimal secondary violet or green notes, and the tone sits just below the point where a stone would appear murky. The mixed brilliant cut is designed to marry the fire of a brilliant style with the broad face up appearance of a step influenced pavilion, so the table and crown facets maximize the face up color and scintillation. The excellent polish ensures that light returns cleanly from the pavilion, reinforcing the vivid sensation. Slightly included at eye level indicates small natural features are present but do not materially impede transparency or visual appeal, and in a 6.57 carat stone these inclusions are often acceptable to informed buyers because they testify to the gem naturalness while still leaving the gemstone highly wearable and investment grade.

When comparing hue and tone to other famous sapphire localities, this Ceylon example contrasts notably with Kashmir sapphires, which are celebrated for a velvety, cornflower blue with a soft, saturated tone that seems to absorb light in a particular way. Kashmir stones tend to show a more diffuse internal silk and a cooler blue with a slight indigo cast, whereas this Sri Lankan sapphire reads brighter and more lively, with clearer facet reflections. Compared to classic Burmese sapphires, which often deliver a deep, royal blue with intense saturation and a somewhat warmer undertone, the Ceylon vivid blue is less heavy and more luminous. Australian and Thai source sapphires frequently present a darker, inky tone that can appear nearly black in low light, a profile that has a different market appeal than the more open and lively Ceylon tone seen here. Madagascan material is variable, and some deposits yield stones that approach the vividness of Sri Lankan examples, while others lean toward greenish or violet modifiers, making careful comparison and identification essential.

For the educated buyer this sapphire offers a compelling balance of desirable attributes. The carat weight of 6.57 carats in a cushion proportion is a notable size that will present well in a solo ring or a classic halo setting. The C.Dunaigre certification and disclosed heat treatment provide transparency that is valued in both retail and secondary markets, and the Sri Lankan origin will appeal to connoisseurs who prize vivid, lively blues that photograph and display strongly under a range of lighting. The mixed brilliant cut and excellent polish enhance the gemstone face up, making the vivid color appear consistent across the table while preserving scintillation when the piece moves. Given the clarity grade and the transparency, the stone is suitable for fine jewellery with minimal risk of visual disruption from internal features. The Natural Sapphire Company stands behind the documentation and quality assessment, and for a buyer seeking a vivid, well cut, and responsibly represented Ceylon blue sapphire this stone represents an attractive combination of aesthetic quality and gemstone integrity.