3.06 Ct. Star Ruby from Burma (Myanmar)

This offering from The Natural Ruby Company is a translucent Burmese star ruby weighing 3.06 carats, presented in an oval profile with dimensions 7.84 by 6.75 by 5.23 mm, cabochon cut and unenhanced. The oval outline has been executed to maintain symmetry across the long and short axes, producing a pleasing, well centered silhouette that optimizes light return within the dome. The cutter preserved a substantial crown height relative to the overall thickness, which enhances the internal light path and strengthens the star effect. This gem exhibits intense color intensity described as pinkish red, a hue that sits between true red and pink, and that shows uniform distribution through the body when viewed under standard daylight. Origin is Burma Myanmar, and the specimen is natural with no evidence of heat or glass filling, a factor that preserves both intrinsic material properties and market value.

The defining optical characteristic is asterism, manifested as a distinct six ray star that centers when the stone is viewed perpendicular to the dome. The star results from densely oriented rutile silk inclusions aligned along the crystallographic directions of corundum, producing a diffraction like reflection rather than a simple surface phenomenon. The star movement is responsive to a point light source, contracting and expanding predictably as the incident angle changes, and the rays remain crisp against the pinkish red backdrop due to the optimal interplay of silk density and translucency. The translucency is high enough to allow the star to form with clarity, while the intense color provides contrast so that the star reads strongly in both incandescent and daylight conditions. Under directional light the central intersection of the rays appears bright and focused, indicating a uniform distribution of aligned silk beneath the dome.

Clarity is graded slightly included on an eye level assessment, and the internal features are consistent with classic star ruby habit. Inclusions include fine silk and a few larger crystalline or healed fracture zones that have been oriented and accommodated by the cutter to avoid disturbing the asterism. Slight inclusions do not detract from the optical performance, rather they can contribute to the width and definition of the star when properly aligned. The surface finish is described as excellent, with polish executed to a high gloss that minimizes surface scattering and preserves sharp star contrast. The cutter achieved a balanced dome curvature, with smooth transition at the girdle perimeter to assist secure bezel seating in jewelry fabrication. The overall finish indicates careful lapidary technique, including stepwise smoothing of the dome and final polishing with progressively finer abrasives to eradicate lap lines and micro abrasion that would otherwise diffuse the star.

From a gemological and practical standpoint this 3.06 carat Burmese cabochon is robust and suitable for everyday wear when set appropriately. Corundum properties include a refractive index in the range 1.762 to 1.770, birefringence approximately 0.008, specific gravity near 4.00, and Mohs hardness 9, all of which inform setting choices and handling considerations. Because the star effect is best seen when light is incident perpendicular to the dome, recommendations include bezel set designs with the star oriented to the top surface, or open backed mounts that permit more light entry for maximum asterism. Avoid exposing the stone to sudden thermal shock and aggressive chemical environments, and exercise caution with ultrasonic cleaning when larger healed fractures are present. This untreated Burmese star ruby represents a combination of classic origin, technical cutting to enhance asterism, and stable physical properties, and it is offered to connoisseurs and jewelers by The Natural Ruby Company as a high quality natural specimen for collectors and refined jewelry projects.