1.65 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This 1.65 carat cushion shaped blue sapphire is a refined example of classic Ceylon character, measuring 7.05 x 6.48 x 3.53 millimeters, with a mixed brilliant cut and an excellent polish. The stone displays a medium intense cornflower blue hue that reads lively and transparent face up, and the mixed brilliant faceting has been executed to balance table size with scintillation, delivering attractive return of light and a pleasing spread of blue across the surface. Clarity is noted as very very slightly included when evaluated at eye level, which for an educated buyer means the gem is effectively eye clean, with only minor internal features that do not detract from visual appeal and contribute to overall transparency. The gem is Other certified, and its origin is Ceylon Sri Lanka, a source historically prized for its satiny, well saturated cornflower tones. Enhancement is standard heat treatment, a stable and widely accepted method used to optimize color and clarity, and the excellent polish ensures crisp facet junctions and maximum brilliance.

For buyers who understand gemstone grading and market considerations, several technical points make this sapphire a compelling purchase. The mixed brilliant cut places brilliant style facets on the pavilion and more traditional step or modified facets on the crown, which enhances both dispersion and color presentation while maintaining a broad face up size for the carat weight indicated. The clarity grade very very slightly included, assessed at eye level, indicates that inclusions are minimal and generally require magnification to study in detail, which preserves the stone value relative to lower clarity grades. Heat treatment in sapphires from Ceylon is both common and accepted by the trade because it modifies color in a way that is permanent under normal wear conditions, and treated Ceylon stones are routinely recorded as desirable in specialized collections when other qualities such as cut, clarity, and origin are strong. The medium intense cornflower blue hue is especially sought after in the Ceylon category, offering a balance between vivid saturation and lightness that lends the gem both everyday wearability and collector interest.

Durability and suitability for daily wear are central strengths of this sapphire, making it an excellent choice for rings, pendants, and other pieces intended for regular use. Sapphire registers nine on the Mohs scale of hardness, second only to diamond, and exhibits substantial toughness, meaning it resists abrasion and retains luster under normal wear conditions. The mixed brilliant cushion shape lends itself to secure mounting options, and recommended settings include four or six prongs for balance and airflow, as well as bezel settings for added protection if the wearer is particularly active. Because this sapphire is naturally transparent and heat treated only, it withstands common cleaning methods, and most heat treated natural sapphires are safe for ultrasonic and steam cleaning, although we advise confirming any treatment reports and using gentle detergents and a soft brush for routine care. Avoid exposure to harsh chemicals and extreme sudden temperature changes, and inspect settings periodically to ensure prongs remain secure. When set by an experienced jeweler this 1.65 carat Ceylon cornflower blue sapphire will combine enduring physical resilience with refined optical performance, and represents the kind of documented, market respected gem that The Natural Sapphire Company is proud to offer to discerning buyers.