3.62 Ct. Star Ruby from Vietnam

This listing describes one translucent 3.62 carat oval shape pinkish red star ruby from Vietnam, supplied through The Natural Ruby Company. The gem is fashioned as a cabochon with dimensions 10.95 x 8.16 x 3.55 mm, displaying an intense color intensity and an excellent polish. Clarity is graded as included when evaluated at eye level, which is typical for natural asteriated corundum, and there has been no enhancement. The combination of weight and dimensions yields an appealing table area and dome profile that supports a strong asterism while preserving color saturation and light return. The pinkish red hue sits toward the warmer side of the ruby spectrum, with saturation sufficient to register as intense, and translucency that allows the classic star to become visible under focused lighting.

The cabochon cut has been executed with attention to symmetry, dome height, and orientation of growth planes, in order to maximize the six ray star. The cutter oriented the piece so that rutile silk inclusions lie parallel to the basal cleavage planes that are responsible for the star effect, producing a well centered star that converges cleanly at the eye. Surface contours are smooth and uniform, and the excellent polish enhances the sharpness of the star and the overall satiny sheen. Clarity characteristics include dispersed silk and some crystal inclusions that are typical of natural Vietnamese material, and these inclusions act constructively to produce a crisp asterism rather than detract from it. There are no open surface reaching fractures that compromise stability, and the cabochon thickness retains structural integrity for jewelry mounting.

From a gemological perspective the stone is corundum, with refractive indices in the typical range for ruby, a specific gravity consistent with natural ruby, and a hardness of nine on the Mohs scale which provides excellent wearability. The optical phenomenon of asterism arises from parallel oriented rutile needles that reflect concentrated bands of light, creating a six ray star when viewed under a single point light source. Birefringence for corundum is low but measurable, and pleochroism may be observed in certain orientations, which is why the cutter selected the cutting plane to balance hue, tone, and the star effect. The intense color grading reflects both the chromophore concentration, principally chromium, and the thickness of the dome which modulates light absorption and scattering. The absence of heat treatment or any other enhancement is significant for collectors, as untreated asteriated rubies with intact natural silk often command premium interest.

For practical use and mounting the cabochon profile and dimensions should be noted when designing a setting, as the high dome and oval outline will benefit from a protective bezel that follows the circumference closely, or a low prong design that minimizes exposure of the dome apex. The measurements 10.95 x 8.16 x 3.55 mm and the weight 3.62 carat allow straightforward translation into standard gallery sizes for custom jewelry, and the cutter left a consistent girdle and stable pavilion thickness to facilitate secure seating. When viewing the asterism for display or appraisal, use a single strong point light and position the stone so that the star aligns with the vertical axis of the jewelry piece, this will produce the most striking star movement under slight head motion. The Natural Ruby Company stands behind the provenance and untreated status of this star ruby and can provide detailed imagery and discussion on setting options, certification pathways, and conservation advice for long term preservation.