0.71 Ct. Purplish Pink Star Sapphire from Ceylon (Sri Lanka)

At The Natural Sapphire Company we present a 0.71 carat oval purplish pink star sapphire, opaque in bodycolour and finished as a traditional cabochon. The stone measures 6.00 by 4.52 by 2.73 millimetres, dimensions that reflect a compact yet well proportioned oval outline, with the depth providing a substantive dome suitable for asterism. The colour registers as purplish pink with a medium intensity grade, evaluated under standard viewing conditions, and the clarity is graded as slightly included at eye level. No enhancement has been performed on this gem, and the material originates from Ceylon, a source well known for silk bearing star sapphires that exhibit distinct asterism when cut and polished with care.

The asterism on this specimen is produced by oriented networks of rutile needles, commonly referred to as silk, that intersect in three predominant directions within the corundum lattice, yielding a classic six ray star under direct lighting. The cabochon cut and dome profile have been executed to align the needle orientation parallel to the base of the cabochon, maximizing star contrast and movement as the light source is translated. Because the piece is opaque, contrast between the star and bodycolour relies primarily on the density and orientation of the silk and on the evenness of the polish. The polish has been graded excellent, which contributes to a crisp star display and minimal surface diffusion of light, allowing the star to resolve cleanly rather than blur. Slight eye level inclusions are present, and these inclusions serve both to scatter the incident light and to anchor the rutile networks, which is typical for natural star sapphires and contributes to the characteristic asterism.

From a lapidary perspective, the cabochon execution demonstrates precise control over symmetry and dome curvature, with the oval outline maintained to provide an even visual axis for the star. The 2.73 millimetre depth functions as the effective dome height, a parameter critical for star placement because dome height influences the angle at which the rutile needles reflect light back to the observer. A dome that is too low will yield a weak or poorly focused star, while an excessively high dome can reduce the apparent saturation of the bodycolour. In this stone the cutter balanced these factors to retain 0.71 carat weight while centering the star near the geometrical apex of the dome, which is optimal for jewelry applications. The lack of enhancement means the stone has not been heat treated or diffusion treated, so the observed colour and silk structure are original to the material, a consideration that is important for collectors who prioritise natural state gemstones.

For practical considerations in mounting and care, the opaque nature and excellent polish of this star sapphire make it well suited to bezel settings that protect the girdle and preserve the orientation of the star with respect to the wearer and the light source. When set for display, orient the dome so that the star aligns with the intended viewing angle, typically top dead centre relative to the finger or pendant face, to maximise the asterism under overhead lighting. Viewing the star under a single point light source will produce the most distinct six ray pattern, whereas diffuse light will soften the effect and emphasise colour. For cleaning, use warm soapy water and a soft brush, and avoid aggressive ultrasonic or steam cleaning if there is any concern about fracture lines or heavily included areas, because the internal silk networks and inclusions can sometimes trap fluids or stress concentrations. The combination of medium colour intensity, classical Ceylon provenance, untreated status, and cabochon craftsmanship makes this 0.71 carat purplish pink star sapphire an excellent specimen for connoisseurs seeking a natural asteria specimen from The Natural Sapphire Company, and our gemological team can provide additional photographic angles and handling recommendations on request.