1.37 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This marquise shape sapphire from The Natural Sapphire Company is a refined example of classical gem proportions combined with modern facet design, weighing 1.37 carats and measuring 8.02 by 4.45 by 4.66 millimeters. The mixed brilliant cut gives this stone a lively face up appearance, balancing large table facets for color and smaller pavilion facets for scintillation, and the excellent polish ensures that light enters and returns efficiently. The gem is transparent with a vivid Royal Blue hue, and its clarity is graded as very slightly included when evaluated at eye level, which for practical purposes means it appears clean to the unaided eye and will present as a pure blue field when set in jewelry. Enhancement is disclosed as heat treated, a widely accepted and stable enhancement used to optimize color and clarity, and the gem comes to you with formal certification, offering documented verification of its identity and basic characteristics.

From a gemological standpoint, a very slightly included sapphire that displays vivid color and excellent cut quality commands attention from educated buyers, because value in corundum is driven primarily by color and secondarily by clarity and cut. This stone’s Royal Blue saturation places it at a premium level, deep enough to read as richly blue while still maintaining the lively brilliance that Ceylon sapphires are celebrated for. The mixed brilliant cut amplifies both color and sparkle, creating a balance between depth of tone and light return. Inclusions described as very slightly included at eye level are typically minute crystal signatures or needlelike orientations that do not compromise structural integrity, and they often serve as natural fingerprints that confirm the gem is natural rather than synthetic. Heat treatment, when properly performed, is permanent and improves overall appearance, and because we disclose this treatment openly, you can evaluate the sapphire’s beauty with full knowledge of its enhancement history.

The origin of this sapphire in Ceylon, Sri Lanka, substantially enhances its desirability and market value, because Ceylon has a centuries long reputation for producing some of the world’s most sought after blue sapphires. Sri Lankan sapphires are known for their characteristic radiance, a combination of vivid color and lively brilliance that results from unique geological conditions and the presence of iron and titanium as chromophores. Collectors and connoisseurs prize Ceylon provenance for the way it tends to yield clear, pure blues that retain a luminous quality even at higher saturations, and provenance can command a measurable premium in the secondary market. The geology of the Ratnapura region and other Sri Lankan mining areas has produced historically important stones, and the term Ceylon remains a shorthand among gem professionals for a particular style of blue that balances depth and lightness. For the educated buyer, the combination of Ceylon origin, vivid Royal Blue color, very slightly included clarity, and an expertly executed mixed brilliant marquise cut signals a gemstone that will perform exceptionally both for visual impact and for long term value retention.

For practical use and design considerations, this 1.37 carat marquise is well suited to ring center settings where its elongated silhouette will visually enhance the finger, and its dimensions give a pleasing spread for the weight. The marquise shape offers an elegant, elongating line, and the mixed brilliant facets will produce attractive fire and scintillation under typical lighting. Corundum’s hardness of 9 on the Mohs scale makes sapphire an excellent choice for everyday wear, though marquise points benefit from protective setting choices such as tapered prongs or a partial bezel to safeguard the tips from impact. At The Natural Sapphire Company we provide high resolution imagery, transparent treatment disclosure, and certification documentation, and we can arrange independent gemological reports on request. We also offer guidance on setting styles that maximize both beauty and security, and we are committed to ethical sourcing and traceability, so you can be confident in both the aesthetic and provenance attributes of this lovely Ceylon Royal Blue marquise sapphire.