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

This specimen is a translucent, rough shape bi color parti sapphire weighing 7.79 carats, with dimensions of 19.77 x 6.73 x 4.80 mm, supplied by The Natural Sapphire Company. The piece is presented in its natural elongated crystal form, with cutting style not applicable and no formal faceting applied, yet it displays an excellent polish on its exterior surfaces. Clarity has been assessed as very slightly included at eye level, indicating that under normal viewing conditions the inclusions are minimal and do not materially interrupt the gem's overall aesthetic. Color intensity is described as medium, which in a parti sapphire context produces an elegant balance between the distinct color zones that make these stones so desirable, and the report confirms no enhancement, so the gem is entirely natural and untreated.

From a gemological perspective the combination of provenance, clarity, and lack of treatment is important to an educated buyer. This sapphire originates in Ceylon Sri Lanka, a source historically noted for producing stones with clear color zoning and a pleasing crystalline habit. Parti sapphires derive their bi color appearance from variations in trace element distribution during crystal growth, often showing two or more hues within a single crystal. In this specimen the medium intensity means the colors are present and discernible without overpowering saturation, allowing for both classic and contemporary design uses. The very slightly included clarity grade indicates that while internal features are present, they are small and localized, and they often contribute to a stone’s individuality without compromising durability. The translucency of the crystal will influence light transmission and how color reads once set or shaped, and the excellent polish suggests the surface has been refined to maximize optical appeal even in its rough form.

For collectors, lapidaries, and bespoke jewelers the value proposition is straightforward. Untreated Ceylon sapphires command a premium in the market because treatment free material is comparatively scarce, and provenance from Sri Lanka adds a historical and qualitative dimension that is recognized by connoisseurs. The 7.79 carat weight and the elongated dimensions of 19.77 x 6.73 x 4.80 mm make this piece versatile, offering multiple pathways depending on a buyer’s goals. A cutter could consider creating an elongated freeform or a slim cabochon to preserve the parti coloration and to emphasize the natural color division, while a designer might choose to retain the crystal as a polished point in a bezel or wire setting to highlight its raw character. For investment minded buyers the combination of untreated status, clear provenance, and the rarity of parti color zoning in larger examples supports long term collectibility. For artisans the medium color intensity and very slightly included clarity make the stone workable for high quality jewellery without the need for enhancement or stabilization.

When evaluating this sapphire it is useful to consider how its physical and gemological attributes align with intended use, and The Natural Sapphire Company is available to provide additional photographic angles, lapidary consultation, and documentation of origin and grading observations. The untreated nature of the stone means it retains all of its natural characteristics for future study or customization, and the Ceylon origin situates it within a respected tradition of sapphire production that resonates with discriminating buyers. Whether retained as a museum quality rough, fashioned into a bespoke statement piece, or commissioned into a bespoke design that celebrates natural crystal form, this bi color parti sapphire offers a rare combination of natural beauty, ethical sourcing, and gemological integrity. If you would like further technical information about potential cutting yields, expected color behavior under different lighting conditions, or secure purchase terms, please contact The Natural Sapphire Company for a detailed consultation.