308.78 Ct. Yellowish Brown Rough Sapphire Crystal from Ceylon (Sri Lanka)

One translucent yellowish brown sapphire weighing 308.78 carats is presented by The Natural Sapphire Company, the stone offered in a various shape with overall dimensions of 70.30 x 26.60 x 21.20 mm. The piece displays a rough crystal cut that preserves much of the original crystal form, complemented by an excellent polish applied to its facets and surfaces. Color intensity is classified as medium intense, which yields a clear but not overpowering saturation across the stone, and the body color reads as a warm yellowish brown that varies slightly with viewing angle. This sapphire is of natural origin, sourced from Ceylon, Sri Lanka, and it has not undergone any enhancement, a detail that we confirm and document for provenance and treatment transparency.

Visually the stone exhibits translucent light transmission, allowing internal features and color zoning to play a significant role in its appearance. The rough crystal cut and the stone size create areas where surface reflections and internal reflections interact, producing subtle shifts in tone from golden yellow to deeper brown. Inclusions and internal characteristics are consistent with an unenhanced natural corundum from Sri Lankan deposits, and these features contribute to the gemological identity of the piece while also influencing the way light moves through the crystal. The medium intense color intensity provides balance between saturation and light interaction, making the sapphire visually substantial when viewed unaided, and responsive to directional lighting without losing the clarity of its overall hue.

From a material perspective the gemstone is corundum, a mineral known for its prevalence in high quality gem material and for a hardness that supports long term wear in jewelry. The size and weight of 308.78 carats place this specimen in a category suitable for collectors and for bespoke commissions where the original rough crystal form is to be retained as a design element. The rough crystal cut presents opportunities for lapidaries and designers to either preserve the existing geometry as an artful, organic centerpiece, or to rework portions of the crystal to emphasize color zones or to achieve symmetrical faceting. The excellent polish means that the stone already benefits from a refined surface finish, which reduces the amount of additional work required to integrate it into a finished piece, and the substantial dimensions allow for creative mounting options including gallery settings, custom bezels, or museum style displays that highlight the raw character of the crystal.

The provenance from Ceylon, Sri Lanka, adds a contextual layer to the sapphire, as Sri Lankan deposits are well known for producing a wide range of corundum colors and for material with distinct textural and inclusion patterns. At The Natural Sapphire Company we document origin and treatment status for each gemstone in our inventory, and this sapphire is presented with a clear statement of no enhancement. For clients seeking further confirmation, we can arrange independent gemological assessment and provide detailed imagery, measurements, and an internal evaluation report upon request. Guidance on setting, conservation, and custom design options is available, and our team can consult on whether to maintain the stone in its current rough crystal cut or to undertake additional cutting for specific optical outcomes, always with attention to preserving carat weight and natural character.