3.69 Ct. Bi Color / Parti Sapphire from Ceylon (Sri Lanka)

One transparent cushion shape bi color parti sapphire, weighing 3.69 carats, presents a clear statement of premium quality through its weight and proportions. At 3.69 carats this sapphire occupies a weight range that is less common than smaller sizes, which contributes to its desirability for fine jewelry where a substantial, yet wearable, gem is required. The measured dimensions of 9.91 by 8.04 by 5.24 millimeters provide an accurate sense of its surface presence and depth, allowing designers and clients to anticipate the visual scale of the finished piece. The carat weight is a primary determinant of rarity and market value in corundum gems, and at 3.69 carats this specimen offers both notable mass and well preserved material, attributes that align with the standards expected of premium natural sapphires offered by The Natural Sapphire Company.

The cutting style and faceting are central to the gemology of this stone, and this sapphire is faceted with a mixed brilliant cut designed to balance scintillation and color retention. The cushion outline is sympathetically proportioned to the crystal, and the mixed brilliant faceting pattern works to optimize light return from the 5.24 millimeter depth, while maintaining the clean silhouette of the cushion form. Excellent polish across facet junctions enhances surface reflection and contributes to a crisp appearance under magnification, while the precision of the faceting supports an even distribution of light across the breadth of the stone. These technical attributes, combined with the transparent body, enable the gem to exhibit both internal fire and surface luster in a manner consistent with higher grade faceted sapphires.

Clarity and color characteristics further define the gem in objective terms. The clarity is graded as very slightly included, evaluated at eye level, indicating that inclusions are minor and do not materially detract from the gem when examined without magnification. This level of clarity supports both visual purity and structural integrity, and it is consistent with natural sapphires of fine quality. Color intensity is described as medium, and the bi color parti nature shows distinct zones of hue across the stone, a characteristic that contributes to its individuality and visual interest. The parti effect produces a pleasing interplay between cooler and warmer tones, and the mixed brilliant faceting aids in presenting those tones with depth and nuance. Enhancement is limited to heat treatment, a standard and stable practice in corundum processing, applied to improve color and clarity without compromising the intrinsic nature of the material.

Provenance and treatment are clear and straightforward, with origin Ceylon, Sri Lanka, and with the enhancement noted as heat treated. Ceylon sapphires are historically and gemologically recognized for their attractive color signatures and for producing material that responds well to precise cutting and polishing. At 3.69 carats this cushion sapphire represents a deliberate selection for clients and craftsmen seeking a natural stone with significant weight, balanced proportions, and controlled enhancement. The Natural Sapphire Company can provide detailed images and gemological information to assist in mounting and appraisal, and the technical attributes described here are intended to support informed decisions about setting style, protective measures, and care. This description focuses on the objective specifications that define the gem, highlighting the weight in carats as a central element in its premium classification, while presenting the full set of attributes that determine its appearance and suitability for fine jewelry.