Stars in Our Eyes: The Optical Phenomenon of Asterism in Gemstones

July 14, 2023 4 min read

Asterism in gemstonesCrystals possess an infinite variety of shapes, sizes, and chemical structures, captivating us with their beauty and intriguing nature. Here at Made In Earth, we have the privilege of new and exciting gemstones tumbling across our paths on a daily basis, leading us to continually marvel at the wonders of the natural world. Their vibrant colours, shimmering iridescence, and the harmonious blend of minerals create truly breathtaking stones that never cease to amaze us.

Amidst these enchanting qualities, there is one optical phenomenon that shines with particular brilliance—Asterism.

Asterism reveals itself as a star-shaped pattern observed in some crystals and minerals. From a single point, six radiant rays or lines extend outward, creating a celestial spectacle reminiscent of a tiny galaxy encapsulated within the stone. This phenomenon adds an extra touch of magic, inviting us to delve into a world where light and minerals intertwine in a cosmic dance.

black star diopside

Asterism is caused by the presence of microscopic needle-like inclusions within the crystal structure of the mineral. These inclusions can be composed of various minerals, such as rutile or hematite, and are oriented in specific directions within the crystal. When light enters the gemstone and interacts with these inclusions, it is reflected and scattered, creating the star-like pattern.

The most common gemstone known for displaying asterism is star sapphire, which is a variety of the mineral corundum. When properly cut and polished, a star sapphire exhibits this special optical spectacle. Other gemstones that can display asterism include star ruby, garnet, diopside, rose quartz and spinel.

Gemstones exhibiting asterism are highly valued and sought after by collectors and enthusiasts due to their unique and striking appearance. The intensity and visibility of the asterism can vary, depending on the quality of the gemstone and the lighting conditions under which it is viewed. 

Asterism, as an optical phenomenon observed in gemstones, does not have specific lore associated with it. However, gemstones themselves have often been steeped in lore and believed to possess various metaphysical properties.

Star Ruby

For example, star sapphires and star rubies, which exhibit asterism, have been associated with mystical and protective qualities in some cultures. In ancient times, it was believed that these stones contained the essence of the stars and could bring good fortune, guidance, and spiritual insight to their wearers. They were thought to enhance intuition, provide protection from negative energies, and symbolise hope and divine connection.

In Indian mythology, star sapphires were linked to the celestial deity Saturn (Shani). It was believed that wearing a star sapphire could appease Saturn and bring blessings, prosperity, and protection from malevolent influences.

In Metaphysical circles Asterism is associated with the following beliefs:

  • Protection: It is believed that gemstones with asterism possess strong protective energies. The star-shaped pattern is seen as a symbol of divine protection, and wearing or carrying such gemstones is thought to safeguard against negative energies, psychic attacks, and accidents.
  • Guidance and Intuition: The star-like rays in asterism are often associated with guidance and intuition. It is believed that crystals with asterism can enhance one's intuitive abilities and provide spiritual guidance, helping individuals make wise decisions and navigate through life's challenges.
  • Celestial Energies: The star-like pattern in asterism is sometimes associated with celestial energies and cosmic connections. These gemstones are believed to facilitate communication with higher realms, angels, and spirit guides. They are considered potent tools for meditation, astral travel, and connecting with the spiritual dimensions.
  • Balance and Harmony: Gemstones exhibiting asterism are said to possess balancing and harmonising energies. They are thought to align and balance the chakras, promoting emotional well-being, inner peace, and spiritual growth. These crystals are often used to enhance overall energy flow and restore harmony within oneself and the surrounding environment.
  • Luck and Fortune: In some cultures, gemstones with asterism are regarded as lucky charms and are believed to bring good fortune and prosperity. They are associated with abundance, success, and manifestation. These crystals are often used in rituals or kept in places associated with wealth and prosperity.

We find ourselves captivated by the beauty and intrigue that gemstones adorned with the celestial phenomenon of Asterism possess, and we hope that you, dear reader, have also been swept away by their enchantment. As we reflect on this awe-inspiring phenomenon, we are reminded of our shared cosmic unity with nature. We are all made of stars, and Asterism serves as a gentle reminder of this profound connection. In closing as we bid farewell, let us carry the enchantment and appreciation for these remarkable gemstones, which never cease to inspire wonder and amazement, while nurturing our understanding of the eternal bond between Earth and the stars above.


It's important to note that these metaphysical beliefs and lore are based on spiritual and cultural traditions and should be seen as subjective interpretations rather than scientifically proven facts. The meanings and effects attributed to crystals can vary between different belief systems and individuals.

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