6.44 Ct. Purple Star Sapphire from Burma (Myanmar)

The Natural Sapphire Company presents a fine example of Burmese star sapphire, a translucent oval cabochon weighing 6.44 carats, with measured dimensions of 10.40 x 8.66 x 6.36 mm. This piece displays a medium intense purple bodycolor, graded for color intensity at the medium intense level. The cutting style is a classic cabochon with an even high dome, chosen specifically to maximize the asterism, and the surface finish is evaluated as excellent polish. Clarity is described as very slightly included when assessed at eye level, a clarity characteristic that in this material contributes positively to the asterism rather than detracting from overall appearance. There has been no enhancement of this sapphire, no heat treatment, diffusion, dye, or other modifications, and the reported origin is Burma Myanmar, a provenance that is historically associated with richly saturated natural sapphires and valued silk inclusion patterns.

The asterism, a defining technical feature of this specimen, is produced by oriented networks of microscopic rutile needles, aligned within the corundum lattice. When the cabochon dome is oriented with its base perpendicular to the crystallographic c axis, these parallel rutile needles intersect optical paths to form a six rayed star under point light. The cutter has preserved and centered this star, resulting in a sharp and well defined six ray pattern that remains stable over the dome rather than fragmented or misaligned. The dome height of 6.36 mm is sufficient to allow the star to project clearly, giving good closure and distinct ray contrast against the purple bodycolor. Precision in the cabochon profile and symmetry of the oval outline are essential to maintain balanced optical effects, and this stone demonstrates careful material planning to align the asterism with the shape axis and to avoid off centered star placement.

Color distribution and internal structure are important when assessing the trade and gemological quality of star sapphires, and this example offers technically desirable attributes. The purple hue exhibits balanced tone and saturation with medium intense color intensity, a tone that communicates both presence and versatility for jewelry. Slight color zoning is present when rotated that is typical of natural Burmese material, producing minor shifts toward red violet under oblique lighting and a cooler purple under direct lighting, which is consistent with weak pleochroic behavior in some gem corundum. The very slightly included clarity grade at eye level notes fine silk like inclusions rather than fractures, these distributed silks are fine and contribute to the asterism while preserving overall transparency and internal glow. The refractive and specific gravity characteristics align with natural corundum parameters, and the excellent polish enhances surface luster and star contrast, permitting strong specular highlights without surface pits or polishing lines.

From a practical and connoisseur perspective this 6.44 carat Burmese purple star sapphire is appropriate for considered bespoke mounting, with setting recommendations focused on protection of the cabochon and optimization of light exposure to reveal the star. A bezel setting with a slightly raised profile will protect the high dome from abrasion while allowing light to strike the dome face and produce a dominant star. An open back or partial gallery can be used to allow transmitted light to energize the stone without exposing it to potential damage. Care should follow standard corundum protocols, avoiding drastic thermal shock and prolonged exposure to strong acids, and cleaning is best performed with warm soapy water and a soft brush, avoiding ultrasonic cleaners when doubt exists about internal stress or surface reaching fissures. Provenance and the untreated status increase both collectible and investment appeal, and The Natural Sapphire Company is available to provide additional technical documentation, custom setting guidance, and high resolution imaging to support appraisal and design decisions.