Individuals born on December 19th are associated with a unique and powerful trio of gemstones: tanzanite, turquoise, and zircon. Unlike most months, which typically claim a single birthstone, December offers a diverse palette of colors and histories, providing a rich selection for those born in the final month of the year. These three stones—each with distinct origins, gemological properties, and symbolic meanings—create a well-rounded set of energies that can support the wearer in various aspects of life. This article explores the history, geological formation, gemological properties, symbolism, and care of these three remarkable birthstones, drawing exclusively from authoritative sources to provide a comprehensive guide for gemstone enthusiasts, jewelry buyers, and students of gemology.
The concept of birthstones is ancient, with roots in the Biblical Book of Exodus, where 12 gemstones were listed on Aaron’s breastplate, representing the 12 tribes of Israel. However, these early lists did not assign stones to months. Modern birthstone lists began to take shape in the 19th and 20th centuries. In 1870, Tiffany & Co. published the first American version of a birthstone list, which included turquoise for December. Over time, the list evolved, and today, December is recognized for its three official birthstones: turquoise, zircon, and tanzanite. Each stone was added to provide a variety of colors and styles, giving individuals born in December more options for personal preference. The addition of tanzanite, a relatively recent discovery, reflects the dynamic nature of gemology and the continuous evolution of tradition.
History and Lore
The history of these three stones spans millennia, with each carrying a unique narrative of discovery and cultural significance.
Turquoise is one of the oldest known gemstones, revered for its distinctive color and protective qualities. Its use dates back to ancient civilizations, where it was often associated with protection and good fortune. The stone’s name is derived from the French phrase pierre tourquoise, meaning "Turkish stone," as it was first brought to Europe from Turkey. However, turquoise has been mined and used in various cultures, including ancient Egypt, where it was used in jewelry and amulets. In many traditions, turquoise is believed to bring wisdom, harmony, and positive energy, making it a stone of protection and healing.
Zircon is one of the oldest minerals on Earth, with zircon crystals dating back billions of years. Despite its ancient origins, zircon has been mistaken for other gemstones, such as diamond, due to its brilliant fire and high refractive index. Historically, zircon was associated with wisdom, clarity, and balance. It was often used in medieval times as a protective stone, believed to ward off evil spirits and promote spiritual growth. The stone’s enduring popularity is a testament to its timeless appeal and gemological excellence.
Tanzanite is the newest addition to the December birthstone family. Discovered relatively recently in 1967 in Tanzania, tanzanite has rapidly gained popularity for its exquisite blue-violet hue and unique trichroism—a property that allows it to display different colors when viewed from different angles. The gemstone was named after the country of its discovery and quickly became a favorite among gemstone enthusiasts and jewelry designers. Its rarity and stunning appearance have made it a symbol of transformation and new beginnings.
Together, these stones represent a journey from ancient wisdom to modern discovery, offering a rich tapestry of history for those born on December 19th.
Geological Formation and Sources
The formation of these gemstones occurs under distinct geological conditions, resulting in their unique properties and limited sources.
Turquoise is a secondary mineral that forms in the near-surface environment through the interaction of copper-rich groundwater with aluminum- and phosphorus-bearing minerals. This process typically occurs in arid regions, where the evaporation of water concentrates the necessary elements. Major sources of turquoise include the United States (particularly Arizona and New Mexico), Iran, and China. The stone’s color, which ranges from soft sky blue to greenish hues, is influenced by the presence of copper (blue) and iron (green). Turquoise is often found in nodules or veins within host rocks, and its quality is determined by factors such as color uniformity and matrix patterns.
Zircon is a zirconium silicate mineral that forms in igneous and metamorphic rocks. It is one of the first minerals to crystallize from magma, and its crystals can be found in granites, syenites, and metamorphic rocks. Zircon is mined in several countries, including Australia, Cambodia, and Sri Lanka. Australian zircon is particularly known for its high quality and is often used in jewelry. The stone’s durability and brilliance make it a popular choice for both ornamental and industrial applications.
Tanzanite is a variety of the mineral zoisite and is found exclusively in a small area near Mount Kilimanjaro in Tanzania. This limited geographic source contributes to its rarity and value. Tanzanite forms under specific geological conditions involving the metamorphism of calcium aluminum silicate rocks. The gemstone’s vivid blue-violet color is the result of heat treatment, which is commonly applied to enhance the stone’s natural hue. While tanzanite is mined in Tanzania, the gemstone’s market availability is carefully controlled to maintain its exclusivity.
The geological origins of these stones highlight their diversity, from the widespread distribution of turquoise and zircon to the localized rarity of tanzanite.
Gemological Properties
The gemological properties of tanzanite, turquoise, and zircon vary significantly, influencing their use in jewelry and care requirements. The following table summarizes key properties based on available data:
| Gemstone | Color Range | Chemical Composition | Hardness (Mohs) | Refractive Index | Notable Properties |
|---|---|---|---|---|---|
| Turquoise | Soft sky blue to greenish hues | Hydrated copper aluminum phosphate | 5–6 | 1.61–1.65 | Often contains a matrix (host rock) |
| Zircon | Typically bright, clear blue | Zirconium silicate (ZrSiO₄) | 6.5–7.5 | 1.92–2.01 | High brilliance and fire |
| Tanzanite | Deep indigo to lavender (violet-blue) | Calcium aluminum hydroxyl silicate | 6.5–7 | 1.69–1.70 | Exhibits trichroism (blue, violet, burgundy) |
Turquoise has a hardness of 5–6 on the Mohs scale, making it relatively soft and susceptible to scratching and damage. Its chemical composition is a hydrated copper aluminum phosphate, and it often contains a matrix, which is the host rock material embedded within the stone. This matrix can create unique patterns, adding to the stone’s character. Turquoise is porous and can absorb oils and chemicals, which may alter its color over time.
Zircon is a durable gemstone with a hardness of 6.5–7.5 on the Mohs scale, making it suitable for everyday wear. Its chemical composition is zirconium silicate, and it has a high refractive index (1.92–2.01), which contributes to its exceptional brilliance and fire. Zircon is known for its clarity and is often faceted to maximize its sparkle. While blue zircon is popular, the stone can occur in a variety of colors, including colorless, yellow, and brown.
Tanzanite has a hardness of 6.5–7 on the Mohs scale, making it moderately durable but still requiring careful handling. Its chemical composition is a calcium aluminum hydroxyl silicate, and it exhibits trichroism, meaning it displays different colors—blue, violet, and burgundy—when viewed from different angles. This property makes tanzanite particularly captivating and unique. The stone’s vivid color is often enhanced through heat treatment, a standard practice in the gemstone industry.
These gemological properties not only define the stones’ physical characteristics but also influence their symbolic meanings and care requirements.
Symbolism and Metaphysical Beliefs
Beyond their physical beauty, these gemstones are imbued with deep symbolic meanings and metaphysical beliefs that resonate with individuals born on December 19th.
Turquoise is widely associated with protection, good fortune, and healing. It is believed to bring wisdom, harmony, and positive energy, making it a stone of spiritual and emotional balance. In many cultures, turquoise is thought to ward off negative energies and promote a sense of peace and well-being. For those born on December 19th, turquoise can serve as a grounding force, encouraging stability and resilience.
Zircon is linked to clarity, wisdom, and a sense of balance. It is believed to enhance intuition, creativity, and motivation. Zircon’s brilliant fire is thought to inspire a sense of purpose and direction, helping individuals navigate life’s challenges with clarity and confidence. For December 19th celebrants, zircon can act as a catalyst for personal growth and intellectual exploration.
Tanzanite represents transformation, spiritual growth, and new beginnings. Its vibrant blue-violet tones are believed to stimulate the throat chakra, encouraging clear communication and self-expression. Those born on December 19th may find that wearing tanzanite helps them articulate their thoughts and feelings with greater ease, fostering harmonious relationships and meaningful connections. Furthermore, tanzanite is considered a stone of transformation, guiding individuals on a path of self-discovery and personal evolution. Its energy is believed to inspire a sense of purpose and direction, empowering wearers to navigate life’s challenges with resilience and grace.
Together, these stones create a powerful set of energies that support spiritual growth, emotional balance, and personal success. Whether used in jewelry, meditation, or spiritual practices, the December 19th birthstones offer a deep and meaningful connection to the natural world and the human spirit.
Care and Cleaning
Proper care is essential to maintain the beauty and longevity of these gemstones, given their varying hardness and sensitivity.
Turquoise, due to its relative softness and porosity, requires gentle handling. It should be cleaned with warm water and a mild soap, using a soft cloth or a soft-bristled brush. Avoid harsh chemicals, ultrasonic cleaners, and prolonged exposure to direct sunlight, as these can cause discoloration or damage. Store turquoise jewelry separately from harder gemstones to prevent scratching.
Zircon is more durable and can be cleaned with warm water and mild soap. It is generally not sensitive to light or heat, making it a more forgiving gemstone in terms of care. However, it should still be stored separately from harder stones to avoid scratches. Zircon’s brilliance can be maintained with regular gentle cleaning.
Tanzanite, with a hardness of 6.5–7, should be handled with care to avoid scratches or impacts. It can be cleaned with warm water and a mild soap, using a soft cloth. Avoid ultrasonic cleaners and steam cleaning, as these can damage the stone. Tanzanite is also sensitive to sudden temperature changes, so it should be kept away from extreme heat or cold. When storing, keep tanzanite jewelry in a separate compartment or soft pouch to protect it from harder gemstones.
By following these simple care instructions, individuals can ensure that their December 19th birthstones remain beautiful, vibrant, and meaningful for years to come.
Conclusion
December 19th is a unique and meaningful date in the world of birthstones, as it is associated with tanzanite, turquoise, and zircon—three gemstones that each carry their own rich history, cultural significance, and gemological properties. Tanzanite, with its rare origin and stunning blue-violet hues, represents spiritual growth, emotional balance, and success. Turquoise, an ancient stone of protection and healing, is believed to bring wisdom, harmony, and positive energy. Zircon, with its brilliant fire and ancient origins, is associated with intuition, creativity, and motivation. Together, these stones create a well-rounded and powerful set of energies that can support the wearer in various aspects of life. Whether chosen for their historical significance, aesthetic appeal, or metaphysical properties, the December 19th birthstones offer a timeless connection to the natural world and a source of inspiration and personal growth.