Star Sapphire Value Guide

The Star Sapphire is a captivating variety of corundum prized for its asterism, a rare optical phenomenon that creates a star-like pattern across the gem's surface. Originating primarily from Sri Lanka, these stones have served as powerful talismans for royalty and clergy throughout history, famously represented by specimens like the Star of India.

What affects the value of Star Sapphire?

• The sharpness and centering of the star, which should be clearly visible under a single light source.
• The body color of the sapphire, with vivid blues typically commanding higher prices within the $2,000-$2,200 range.
• The transparency and overall clarity of the stone, despite the necessary presence of rutile needles.
• The total carat weight and the quality of the cabochon polish and symmetry.

How to Identify Star Sapphire?

• Examine the stone for a distinct six-rayed star effect caused by light reflecting off needle-like rutile inclusions.
• Verify the material as corundum, which ranks a 9 on the Mohs scale of hardness.
• Look for a smooth, cabochon cut, as this specific shape is required to properly display the internal asterism.
• Check for natural silk-like inclusions under magnification to distinguish genuine Sri Lankan origin from synthetic alternatives.

History of Star Sapphire

Star sapphires have been admired for centuries, particularly in Asia, where they are considered powerful talismans. The unique star effect, known as asterism, is caused by reflections from tiny, needle-like inclusions of rutile within the stone. These gems were often worn by royalty and clergy, believed to offer protection and bring good fortune. Some of the most famous star sapphires include the 'Star of India' and the 'Black Star of Queensland'.