4.00 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This transparent blue sapphire weighs 4.00 carats, offering a substantial presence in an Asscher octagon shape. The gem measures 8.73 by 8.46 by 5.89 mm, and displays an Asscher cut that emphasizes symmetry and stepped pavilion facets. Clarity is graded as very very slightly included when evaluated at eye level, and the stone exhibits vivid color intensity with an excellent polish. Origin is Ceylon Sri Lanka, and the sapphire has been heat treated, disclosed as part of its enhancement history. The Natural Sapphire Company presents this sapphire with a clear description of its physical attributes and provenance.

The 4.00 carat weight is central to the stones value and rarity. Sapphires at or above four carats are markedly less common than smaller sizes, and the market price per carat typically increases as weight increases, particularly for examples that remain eye clean and retain strong color. In this specimen the combination of substantial weight, vivid color saturation, and very very slight inclusions evaluated at eye level creates a tier of rarity that is considerably higher than similarly colored stones under three carats. The Asscher cut and the given proportions preserve a generous face up appearance, while the measured depth contributes to stable light return, supporting the vivid tone without appearing overly dark. For collectors and designers who prioritize both presence and optical quality, the 4.00 carat weight transforms this sapphire from a choice gem into a notable example of Ceylon material.

From a practical and valuation perspective the documented heat treatment is consistent with common and stable enhancement practices for sapphire, and it is fully disclosed to maintain transparency. The excellent polish and precise Asscher faceting enhance the stones appeal and help sustain its long term desirability. When considering settings and future resale, the solid carat weight combined with origin and eye level clarity will be key factors in appraisal. The Natural Sapphire Company can provide further documentation and imagery to support evaluation, and the technical details provided here are intended to convey the qualities that contribute to this sapphires rarity and market value.