Star Ruby Gemstone
Star Ruby is a rare and fascinating variety of ruby that displays a natural six-rayed star pattern across the surface of the gemstone when exposed to light. This remarkable optical phenomenon is known as asterism and is caused by microscopic rutile needle inclusions within the ruby crystal.
Unlike transparent rubies that are usually faceted, star rubies are cut as smooth cabochons. This cutting style allows the internal inclusions to reflect light correctly and reveal the star effect clearly. When light moves across the gemstone, the star appears to glide across the dome of the stone.
The most desirable star rubies display a strong red body color combined with a sharp, well-centered star. These gemstones are found in several important sources including Myanmar (Burma), Sri Lanka, Thailand, Madagascar, and Vietnam.
Star ruby quality is determined by factors such as the brightness and symmetry of the star, color intensity, transparency, and overall gemstone size. Well-defined stars with vivid color are considered the most valuable.
Explore our collection of natural star ruby gemstones carefully selected for their beauty and character. To learn more about how the star effect forms and how these unique gemstones are evaluated, read our detailed Star Ruby Gemopedia Guide.
Star Ruby FAQ
What is a Star Ruby?
A star ruby is a variety of ruby that displays a natural six-rayed star pattern on the surface of the gemstone caused by the optical phenomenon known as asterism.
What causes the star effect in Star Ruby?
The star is produced by fine rutile needle inclusions arranged in specific directions inside the ruby crystal. When light reflects on the cabochon surface, the six-rayed star becomes visible.
Are Star Rubies valuable?
Yes. High quality star rubies with strong color and a sharp centered star are rare and can be highly valuable, especially stones from famous origins such as Myanmar and Sri Lanka.