September is represented by two distinct gemstones in contemporary jewelry design and birthstone traditions: the sapphire and the Cobalt Cat’s Eye. While sapphire has a long-standing historical and cultural significance, the Cobalt Cat’s Eye is a modern creation—a synthetic stone designed to mimic the appearance of natural gemstones at a more accessible price. The Kendra Scott brand, known for its elegant and wearable designs, offers September birthstone jewelry that incorporates these stones, particularly the Cobalt Cat’s Eye, as a signature element. This article explores the properties, symbolism, and market presence of these stones, with a focus on how they are utilized in Kendra Scott’s collection and the broader context of birthstone jewelry.
History and Lore
The sapphire has been revered for centuries, with a history that spans multiple civilizations. Ancient cultures attributed mystical and protective properties to the stone, believing it could ward off evil and bring wisdom. In medieval Europe, sapphires were associated with royalty and were often worn by monarchs as symbols of power and divine favor. The name "sapphire" is derived from the Greek word sappheiros, which originally referred to the blue lapis lazuli, a confusion that persisted until more precise gemological classification emerged in the Renaissance.
The Cobalt Cat’s Eye, on the other hand, is a relatively modern creation. It is not a naturally occurring gemstone but a synthetic material made from a composite of cobalt blue glass and a chatoyant fiber. This combination creates the illusion of a natural "cat’s eye" effect—where the stone appears to have a single reflective line that mimics the pupil of a cat’s eye when viewed under light. The Cobalt Cat’s Eye is a cost-effective alternative to natural cat’s eye stones such as chrysoberyl and is often used in fashion jewelry to replicate the appearance of more valuable gemstones.
In the context of birthstones, September is one of the few months associated with more than one gemstone. While sapphire is the traditional choice, the Cobalt Cat’s Eye has gained popularity in contemporary jewelry design—especially in mass-market and designer collections like Kendra Scott’s. This dual association reflects the evolving nature of birthstone traditions, where historical significance is sometimes balanced with modern aesthetics and affordability.
Geological Formation and Sources
The sapphire is a type of corundum, a mineral composed of aluminum oxide (Al₂O₃). What differentiates sapphires from rubies—another variety of corundum—is the trace elements that cause coloration. In the case of sapphires, the blue color is primarily due to the presence of iron and titanium. Natural sapphires form under high-pressure and high-temperature conditions in the Earth's crust, often in metamorphic or igneous rock formations.
Major sources of natural sapphires include:
- Sri Lanka: Known for producing some of the finest blue sapphires, often referred to as "Ceylon sapphires."
- Myanmar (Burma): Famous for its "pigeon's blood" sapphires, which are highly saturated and intensely colored.
- India: A historical source of sapphires, especially from the Kollur mine in Golconda.
- Madagascar: A significant modern source, known for producing a wide range of sapphire colors.
- Australia: Known for producing star sapphires and lighter-colored sapphires.
The Cobalt Cat’s Eye is not a naturally occurring gemstone. It is a composite material made from synthetic cobalt blue glass and a chatoyant fiber, often composed of borosilicate glass or fiberglass. The fiber is embedded in the glass and aligned in a single direction, which creates the cat’s eye effect when light reflects off it. This material is manufactured in controlled environments and is not found in nature. The creation of such synthetic materials is a response to the high cost and limited availability of natural cat’s eye gemstones.
The use of the Cobalt Cat’s Eye in jewelry, particularly in brands like Kendra Scott, reflects a trend toward affordable luxury—where the visual appeal of a precious gemstone is replicated with synthetic materials that are more accessible and cost-effective.
Gemological Properties
Sapphire
- Chemical Formula: Al₂O₃ (aluminum oxide)
- Hardness (Mohs Scale): 9
- Refractive Index: 1.76–1.78
- Color: Primarily blue, but sapphires can occur in almost any color (except red, which is classified as a ruby).
- Luster: Vitreous (glassy)
- Transparency: Transparent to translucent
- Cleavage: Sapphires have a weak to moderate cleavage, which means they can be susceptible to chipping if struck along the correct plane.
- Inclusions: Natural sapphires often contain inclusions, which are small internal features that can help distinguish them from synthetic stones.
Sapphires are among the hardest natural gemstones, second only to diamonds. This high hardness makes them durable and suitable for use in everyday jewelry, including rings and bracelets. However, their cleavage means that they can still be damaged if struck at the right angle or subjected to excessive force.
Cobalt Cat’s Eye
- Material: Composite of synthetic cobalt blue glass and chatoyant fiber.
- Hardness (Mohs Scale): Approximately 6–7
- Luster: Vitreous to silky (depending on the alignment of the fiber)
- Transparency: Translucent to opaque
- Cleavage: None, as it is not a naturally occurring mineral.
- Inclusions: None, as it is a man-made composite.
The Cobalt Cat’s Eye is significantly softer than sapphire and is more prone to scratching and wear. It is not typically used in rings or other jewelry that may be subjected to frequent impact. Instead, it is more commonly used in earrings, pendants, and other lightweight jewelry where the risk of damage is lower.
Symbolism and Metaphysical Beliefs
Sapphire
Sapphire has long been associated with wisdom, clarity, and spiritual insight. In ancient times, it was believed to be a stone of the divine, used in religious and royal ceremonies. The Greeks and Romans believed that sapphires could bring protection from harm and promote truthfulness and sincerity. In medieval Europe, sapphires were often worn by scholars and clergy, symbolizing purity and divine favor.
In modern metaphysical traditions, sapphires are thought to enhance mental clarity, focus, and emotional stability. They are often used in meditation and spiritual practices to promote inner peace and a deeper connection to the divine. Some also believe that sapphires can help in manifesting goals and overcoming obstacles.
As the birthstone for September, sapphire is seen as a symbol of loyalty, sincerity, and wisdom. It is believed to bring good fortune and protection to those who wear it, especially when set in gold or silver.
Cobalt Cat’s Eye
The Cobalt Cat’s Eye does not have the same historical or spiritual significance as sapphire. As a synthetic material, it is not traditionally associated with metaphysical properties. However, in modern jewelry design, it is often used to evoke a sense of mystery, elegance, and intrigue. The cat’s eye effect, which mimics the reflective pupil of a cat’s eye, is often interpreted as a symbol of intuition, insight, and protection.
In some contemporary metaphysical circles, the cat’s eye effect is believed to enhance perception and awareness, helping the wearer to see through deception and make more informed decisions. While these beliefs are not rooted in traditional gemology or ancient lore, they reflect the evolving symbolism of gemstones in modern culture.
Care and Cleaning
Proper care is essential to preserving the beauty and longevity of gemstone jewelry. The care instructions for sapphire and Cobalt Cat’s Eye differ due to their distinct compositions and properties.
Sapphire
- Cleaning: Sapphires can be cleaned using a soft cloth, mild soap, and warm water. A soft-bristled brush can be used to gently remove dirt from the surface. Ultrasonic cleaners can also be used, but caution is advised if the stone has inclusions or is set in a delicate setting.
- Storage: Store sapphire jewelry in a soft pouch or jewelry box to prevent scratches from harder gemstones.
- Avoiding Damage: Avoid exposing sapphires to sudden temperature changes or harsh chemicals, as this can weaken the stone or damage the setting.
Cobalt Cat’s Eye
- Cleaning: Due to its lower hardness and synthetic composition, the Cobalt Cat’s Eye should not be cleaned with harsh chemicals or ultrasonic cleaners. A soft, damp cloth is sufficient for cleaning.
- Storage: Store in a dry, cool place, away from direct sunlight or heat sources, to prevent fading or warping of the material.
- Avoiding Damage: Avoid abrasive materials or rough handling, as this can cause scratches or damage to the surface.
Conclusion
The September birthstone is a unique example of how birthstone traditions can incorporate both natural gemstones and synthetic materials. The sapphire, with its rich history and enduring symbolism, represents the traditional roots of birthstone jewelry, while the Cobalt Cat’s Eye reflects the modern, innovative side of the industry. Both stones have their own charm and appeal, and their use in brands like Kendra Scott highlights the balance between affordability, aesthetics, and craftsmanship.
For those born in September, wearing jewelry featuring sapphire or Cobalt Cat’s Eye can be a meaningful way to connect with the month’s symbolism and beauty. Whether as a personal accessory or a thoughtful gift, September birthstone jewelry offers a blend of style, meaning, and artistry that continues to captivate gemstone enthusiasts and jewelry lovers alike.