Star Sapphire Cabochon Value Guide

This contemporary Sri Lankan Star Sapphire is highly collectible due to its distinct asterism, a rare optical phenomenon where light reflects off needle-like inclusions to form a star. Its natural grey hue and precise cabochon cut make it a sought-after specimen for both gem enthusiasts and jewelry designers.

What affects the value of Star Sapphire Cabochon?

• The sharpness and centering of the star; a well-defined, symmetrical six-point star significantly increases the $750-$825 valuation.
• The quality of the cabochon polish and the overall symmetry of the dome shape.
• The clarity of the grey body color and the absence of large, distracting internal fractures.
• The total carat weight and the origin, as Sri Lankan (Ceylon) stones carry a premium in the contemporary market.

How to Identify Star Sapphire Cabochon?

• Verify the presence of a six-rayed star that moves across the surface of the cabochon as the light source or stone is shifted.
• Examine the base of the stone; natural Sri Lankan sapphires often show uneven bottoms or slight surface reaching inclusions rather than being perfectly flat.
• Look for the characteristic 'silk' or fine rutile needle-like inclusions under magnification that are responsible for the star effect.
• Check for a consistent grey body color that remains stable under different lighting temperatures.

History of Star Sapphire Cabochon

Star sapphires are a rare variety of sapphire that exhibit asterism, a star-like phenomenon, when viewed under a single overhead light source. This optical effect is caused by intersecting needle-like inclusions within the crystal structure. These unique gems have been prized for centuries and are often associated with destiny and protection.