December is a month rich in symbolism and tradition, and for those born on December 15th, the month offers a special connection through the triad of blue birthstones: Tanzanite, Turquoise, and Zircon. These gemstones, each unique in their geological formation, cultural significance, and metaphysical properties, represent a powerful combination of beauty, meaning, and historical resonance. Together, they form a distinct trio that captures the essence of success, gratitude, and serenity—qualities that are believed to resonate deeply with individuals born on this day.
This article explores the significance of these three December 15th birthstones in detail, drawing from the most reliable and consistent information available in the provided sources. It delves into their historical uses, gemological properties, cultural symbolism, and practical considerations for care and preservation. Whether you are a gemstone enthusiast, a jewelry buyer, or simply curious about the meaning behind your birthstone, this in-depth look offers valuable insight into the world of December’s blue gems.
History and Lore
The tradition of birthstones—assigning a specific gemstone to each month of the year—dates back to biblical times, with roots in the High Priest’s breastplate described in Exodus 28:17–20. Over centuries, this practice evolved, incorporating different cultural interpretations and adaptations. While many months are associated with a single birthstone, December is unique in that it is linked to multiple gems, including Tanzanite, Turquoise, and Zircon, with Blue Topaz also sometimes included as an alternative.
For individuals born on December 15th, these gemstones hold a special place in the tradition. Tanzanite, in particular, was officially recognized as a birthstone in 2002, just over a decade after its discovery in Tanzania in 1967. Its relatively recent emergence in the gemstone world adds a modern touch to the age-old practice of birthstone symbolism.
Turquoise, on the other hand, has a long and storied history. It has been used for thousands of years across various civilizations, from ancient Egypt to the indigenous cultures of the American Southwest. It was highly valued for its protective and spiritual properties and often used in amulets and ceremonial objects.
Zircon, especially in its blue variety, also has a rich history. It has been found in ancient jewelry and was once mistaken for other gemstones, such as zircon and topaz. Its vibrant blue coloration, achieved through heat treatment, makes it a popular choice for those seeking a more affordable alternative to Tanzanite.
These three gemstones, though different in their origins and properties, share a common theme of success, protection, and emotional balance. They are believed to enhance the wearer’s natural qualities and provide support in achieving their goals and ambitions. For those born on December 15th, wearing these stones is seen as a way to connect with their inner strength and maintain a sense of peace and gratitude.
Geological Formation and Sources
Each of the December 15th birthstones—Tanzanite, Turquoise, and Zircon—has a distinct geological origin and set of characteristics that influence their rarity, beauty, and value.
Tanzanite
Tanzanite is a relatively rare gemstone, found only in one location in the world: Merelani Hills in Tanzania, near the famous Mount Kilimanjaro. It was first discovered in 1967 and was initially misidentified as a variety of zoisite. Tanzanite is a trichroic gemstone, meaning it exhibits three different colors when viewed from different angles—typically shades of blue, purple, and brown. The blue coloration is the most desirable and is achieved through heat treatment, which enhances the stone’s natural beauty.
The geological formation of Tanzanite is closely tied to the presence of vanadium, which is responsible for its striking blue hue. It forms in metamorphic rock under high-pressure conditions and is often found in association with other minerals such as quartz and garnet. Due to its limited geographic source, Tanzanite is considered one of the rarest gemstones in the world.
Turquoise
Turquoise is a phosphate mineral that forms in the oxidized zones of copper deposits. It is typically found in arid regions where the right combination of copper, aluminum, and phosphorus exists. The most well-known sources of turquoise include Iran, China, Egypt, the United States (particularly Arizona and Nevada), and Mexico.
The blue-green color of turquoise is due to the presence of copper, while the characteristic veining is caused by the presence of other minerals such as iron oxides. Turquoise is relatively soft compared to other gemstones, with a Mohs hardness of 5 to 6, making it more susceptible to scratches and damage.
Historically, turquoise has been used for its beauty and spiritual significance. In ancient Egypt, it was used to adorn the masks of pharaohs and was believed to have protective powers. Native American tribes in the American Southwest also valued turquoise highly, using it in jewelry, ceremonial objects, and as a symbol of good fortune.
Zircon
Zircon is a zirconium silicate that occurs in a wide range of colors, including colorless, yellow, red, and blue. The blue variety, which is most commonly used in jewelry, is created through heat treatment. Natural zircon can be found in many parts of the world, including Australia, Sri Lanka, Madagascar, and Thailand.
Zircon is known for its high refractive index and dispersion, giving it a brilliance that is similar to diamond. It is also relatively hard, with a Mohs hardness of 6 to 7.5, making it more durable than turquoise but less so than Tanzanite.
Zircon has been used in jewelry for centuries, often being mistaken for other gems like topaz or diamond. In some cultures, it was believed to have protective properties and was used in amulets and talismans. Its vibrant blue color and affordability have made it a popular alternative to more expensive blue gemstones.
Gemological Properties
Each of the December 15th birthstones has unique gemological properties that contribute to their beauty, durability, and value. Understanding these properties is essential for both collectors and jewelry wearers.
Tanzanite
- Chemical Formula: CaAl₂(SiO₄)(OH)₂
- Hardness (Mohs Scale): 6 to 7
- Refractive Index: 1.694 to 1.705
- Color: Blue, purple, and brown (trichroic)
- Luster: Vitreous
- Transparency: Transparent to translucent
- Cleavage: Perfect in one direction
- Specific Gravity: 3.1 to 3.4
Tanzanite is a relatively soft gemstone, so it requires careful handling to avoid scratches and chipping. Its trichroic nature means that the color can vary depending on the direction of light, making it a fascinating gemstone to study under different angles. Tanzanite is often cut into oval, cushion, or round shapes to enhance its color and brilliance.
Turquoise
- Chemical Formula: Al₂BePO₄(OH)₂
- Hardness (Mohs Scale): 5 to 6
- Refractive Index: 1.61 to 1.65
- Color: Blue to greenish-blue
- Luster: Waxy to greasy
- Transparency: Opaque to slightly translucent
- Specific Gravity: 2.6 to 2.8
Turquoise is a porous and relatively soft gemstone that is sensitive to chemicals and moisture. It often contains natural inclusions and veins, which are considered part of its charm. Because of its softness, it is best suited for earrings or pendants rather than rings or bracelets where it could be more easily damaged.
Zircon
- Chemical Formula: ZrSiO₄
- Hardness (Mohs Scale): 6 to 7.5
- Refractive Index: 1.92 to 2.00
- Color: Blue (most common in jewelry), yellow, red, colorless
- Luster: Vitreous
- Transparency: Transparent to translucent
- Specific Gravity: 4.5 to 4.7
Zircon is known for its high refractive index and dispersion, which gives it a brilliant sparkle. The blue variety is the most popular in jewelry and is typically heat-treated to enhance its color. Zircon is more durable than Turquoise but less so than Tanzanite, making it a good option for everyday wear, especially in earrings and pendants.
Symbolism and Metaphysical Beliefs
Each of the December 15th birthstones carries its own set of symbolic meanings and metaphysical properties, which have been attributed to them across different cultures and eras.
Tanzanite
Tanzanite is associated with emotional healing, intuition, and spiritual growth. It is believed to help the wearer release negative emotions and promote a sense of inner peace and harmony. Tanzanite is also linked to success and ambition, making it a popular choice for those seeking to achieve their goals and aspirations.
Metaphysically, Tanzanite is thought to enhance communication with the divine and open the heart to higher wisdom. It is also believed to help with sleep and dreams, promoting restful sleep and vivid, meaningful dreams.
Turquoise
Turquoise has long been regarded as a stone of protection, good luck, and spiritual guidance. It is believed to ward off negative energy and promote a sense of calm and stability. In many cultures, turquoise is used as an amulet to protect against illness, misfortune, and evil spirits.
Turquoise is also associated with healing, especially for the throat and respiratory system. It is believed to enhance communication and encourage honesty and truthfulness in speech. Turquoise is often used in meditation practices to promote a deeper connection with the self and the universe.
Zircon
Zircon is known for its amplifying properties, enhancing the wearer’s energy and intentions. It is believed to help with focus, mental clarity, and decision-making, making it a useful stone for those who need to make important choices or overcome indecision.
Zircon is also associated with confidence and self-expression. It is thought to help the wearer speak their truth and stand up for themselves. In some cultures, Zircon is used in rituals to enhance psychic abilities and connect with the spiritual realm.
Care and Cleaning
Proper care and maintenance are essential to preserving the beauty and longevity of the December 15th birthstones. Because of their different hardness levels and sensitivities, each gemstone requires specific care instructions.
Tanzanite
Tanzanite is relatively soft and can be easily scratched or chipped. It should be cleaned with mild soap and warm water, using a soft cloth or brush. Avoid using ultrasonic cleaners or steamers, as these can damage the stone. Tanzanite should also be stored separately from harder gemstones to prevent scratches.
Because of its trichroic nature, Tanzanite should be handled with care when setting it in jewelry to ensure that the most desirable color is displayed. It is best suited for pocket or display pieces rather than everyday wear.
Turquoise
Turquoise is a porous and fragile gemstone that requires gentle handling. It should be cleaned with a soft, damp cloth to avoid damage. Avoid using harsh chemicals, abrasive cleaners, or ultrasonic cleaners, as these can cause the stone to lose its color or become brittle.
Turquoise should be stored in a cool, dry place, away from direct sunlight and moisture. It should also be kept away from perfumes, lotions, and other chemicals that can penetrate its porous surface and cause discoloration.
Because of its softness and fragility, Turquoise is best suited for earrings or pendants rather than rings or bracelets. It should be handled with care to avoid chipping or breaking.
Zircon
Zircon is more durable than Turquoise but less so than Tanzanite. It can be cleaned with mild soap and warm water or a soft cloth and mild detergent. Avoid using ultrasonic cleaners, as these can cause damage to the stone.
Zircon should be stored separately from harder gemstones to prevent scratches. It is suitable for everyday wear, especially in earrings and pendants, where it is less likely to be subjected to impact or abrasion.
Zircon is also sensitive to high heat, so it should not be exposed to prolonged exposure to heat or direct sunlight, as this can cause it to lose its color or become brittle.
Conclusion
The December 15th birthstones—Tanzanite, Turquoise, and Zircon—offer a rich and diverse array of beauty, symbolism, and meaning. Each gemstone has its own unique geological formation, cultural significance, and metaphysical properties that make it a valuable addition to the world of gemology and jewelry.
Tanzanite, with its stunning blue and purple hues, represents emotional healing and spiritual growth. Turquoise, with its deep blue-green color and intricate veining, is a symbol of protection, good luck, and spiritual guidance. Zircon, in its vibrant blue form, is associated with mental clarity, confidence, and self-expression.
Together, these three gemstones form a powerful triad that reflects the themes of success, gratitude, and serenity that are believed to resonate with those born on December 15th. Whether worn as jewelry, used in meditation, or collected as a symbol of personal meaning, these gemstones offer a meaningful connection to the past and a source of inspiration for the future.
For those who wear these stones, they serve as a reminder of the beauty and complexity of the natural world and the enduring power of gemstones to inspire, protect, and transform.