4.71 Ct. Greyish Blue Star Sapphire from Ceylon (Sri Lanka)

This translucent 4.71 carat round greyish blue star sapphire measures 10.60 x 9.96 x 4.18 mm, and its proportions reflect deliberate lapidary control to balance light transmission with asterism visibility. The stone is fashioned as a double cabochon, a cutting approach that aligns the sapphire crystal with its trigonal c axis beneath the domed surface to optimize the interaction of parallel rutile needles, producing a classical six ray star that travels smoothly across the dome as the stone or light source moves. Clarity is graded very slightly included evaluated at eye level, a level that preserves a clean visual field while allowing the fine silk responsible for a crisp star to remain evenly distributed. Color reads as greyish blue with intense color intensity, a saturation that enhances the star contrast without overpowering the soft transmission of light, and the excellent polish delivers a high degree of surface luster and precise curvature that keeps the asterism sharply defined from multiple viewing angles. No enhancement has been applied to this gem, and its Ceylon Sri Lanka origin is consistent with the classic silk textures and color tones prized in high quality star sapphires.

Over time this untreated Ceylon star sapphire will continue to captivate through a combination of intrinsic material stability and superior cutting and finishing. Corundum is a durable mineral with Mohs hardness of 9, offering strong resistance to abrasion and surface wear so that the excellent polish and the domed geometry will retain their reflective integrity under normal wear. The natural asterism is a structural phenomenon tied to aligned needle inclusions and is therefore stable, not prone to fading or alteration, which means the silky star will remain a lively optical feature for generations. For long term presentation we recommend routine gentle cleaning with warm water, mild detergent and a soft brush, and avoidance of harsh acids or prolonged exposure to extreme heat, to protect the polish and mounting settings. This specimen, offered by The Natural Sapphire Company, represents both a finely executed lapidary study in asterism and a timeless natural beauty that will continue to draw attention and admiration over the years.