0.99 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This transparent, round shape blue sapphire weighs 0.99 carat and measures 5.47 by 5.49 by 3.80 mm, presented with a mixed brilliant cut that balances scintillation and color depth. The gem exhibits an intense color intensity and an excellent polish, characteristics that speak to careful cutting and finishing. Clarity has been evaluated at eye level as very slightly included, meaning that the stone presents with minimal inclusions visible to the unaided eye, which preserves clean visual appeal while still demonstrating natural origin. This sapphire has been heat treated, a widely accepted and standard enhancement for corundum that improves color without compromising stability. Origin is Ceylon Sri Lanka, a source long respected for richly saturated blue sapphires, and this piece is offered by The Natural Sapphire Company, which provides hands on expertise in selecting and presenting stones with clear provenance and accurate grading.

From a technical perspective, the mixed brilliant cut used here is designed to optimize both light return and hue saturation. The crown and pavilion facet arrangement in a mixed brilliant encourages lively fire while allowing the intense blue to remain the focal point, avoiding a washed out appearance that can occur with overly shallow or deep proportions. With the two diameter measurements nearly identical, the round outline is very well centered, and the depth of 3.80 mm relative to an average diameter of 5.48 mm gives a depth proportion of about 69 percent, a proportion that supports deep color and a strong face up presence for a stone close to 1 carat. The excellent polish indicates that facet junctions are clean and reflective, maximizing brilliance and ensuring that light passes through and reflects back from the pavilion with minimal surface scattering. For the educated buyer who values measurable attributes, these proportions combined with the clarity grade and polish make for a gem that performs well visually and is well documented.

Durability is one of the primary reasons sapphires are recommended for everyday jewelry, and this specimen is no exception. Corundum rates 9 on the Mohs hardness scale, second only to diamond among commonly used gemstones, which confers strong scratch resistance for rings, bracelets, pendants and everyday earrings. Sapphires are also structurally tough, lacking the perfect cleavage that makes some minerals vulnerable to splitting, so normal wear does not easily compromise the stone. Heat treatment at reasonable temperatures as applied to this stone is stable and does not reduce hardness or toughness, it simply enhances color and overall appearance. For daily wear I recommend secure mounting, for example four or six prong settings with a modest bezel lip or a full bezel for added protection, and routine gentle cleaning in warm soapy water with a soft brush to maintain brilliance, avoiding strong acids or harsh ultrasonic exposure only if the setting includes other materials sensitive to those conditions.

For the discerning buyer, value is derived from a combination of measurable attributes, origin, and treatment disclosure. This Ceylon origin sapphire shows the classic intense blue that collectors seek, and when combined with a near one carat weight, very slightly included clarity at eye level, and an excellent polish, the result is a versatile and desirable gem. Heat treatment is an industry standard enhancement for sapphires and is fully disclosed for transparent evaluation of value and market comparability. When you select this sapphire through The Natural Sapphire Company you benefit from specialist knowledge about cut, clarity, color and provenance, and guidance on setting and care to ensure the gem remains an enduring part of your jewelry collection. This sapphire is suitable for a refined solitaire ring or a sophisticated pendant, offering both the visual depth appreciated by connoisseurs and the technical durability needed for everyday wear.