Labradorite: The Gemstone of Mystical Fire

Labradorite is a captivating feldspar mineral known for its stunning play-of-color, a phenomenon called labradorescence. This unique optical effect gives the gemstone a vibrant, iridescent sheen that shifts and dances with movement, making it a sought-after choice for jewelry designers and collectors alike.

Key Features

The defining characteristic of labradorite is its labradorescence, which appears as flashes of color, often blues, greens, yellows, and even oranges or purples, against a dark background. The intensity, uniformity, and range of colors contribute to its beauty and value.

• Labradorescence: The primary allure, displaying spectral colors due to light diffraction within the mineral's structure.
• Body Color: The base color of the labradorite, typically gray, brown, or black, which provides a contrast for the iridescent flashes.
• Hardness: With a Mohs hardness of 6 to 6.5, labradorite is moderately durable, suitable for most jewelry types with proper care.
• Clarity: Inclusions are common and can affect transparency, but some are accepted as part of the natural character of the stone.

Origin and History

Labradorite was first discovered in the mid-18th century on the Spectacle Peninsula in Labrador, Canada, by Moravian missionaries. Legend has it that the stone was found when a warrior struck a rock with his spear, releasing the trapped light within. Since its discovery, it has been cherished for its ethereal beauty and associated mystical properties.

Types / Variations

While classic labradorite exhibits blue and green labradorescence, several variations are prized:

• Spectrolite: A rare and highly valued type of labradorite, often found in Finland, known for its full spectrum of vibrant colors and exceptional brilliance.
• Andesine: A rarer feldspar mineral that sometimes exhibits a reddish or orange hue, often heat-treated to enhance color. Its classification as a distinct species or a variety of labradorite is sometimes debated.
• Rainbow Labradorite: This term often refers to labradorite with a predominant, vibrant blue and green labradorescence, sometimes with hints of other colors.

How It's Made

Labradorite is a natural mineral that forms through igneous processes, typically in mafic, intrusive rocks like gabbro and basalt, or in metamorphic rocks. It is a plagioclase feldspar, a solid solution between albite and anorthite. The characteristic labradorescence is not due to pigment but to the lamellar structure within the mineral. Light waves interfere with these thin, parallel layers of different feldspar compositions, creating the iridescent effect.

Grading & Quality Standards

Labradorite is not graded using the traditional 4Cs (carat, cut, clarity, color) like diamonds. Instead, its quality is assessed based on:

• Color Play (Labradorescence): The intensity, spectral range, and dominance of colors are paramount. Brighter, broader flashes covering a larger surface area are more desirable.
• Body Color: A darker, more uniform body color provides a better backdrop for the labradorescence.
• Cut: The cut is optimized to display the labradorescence to its fullest potential, often using cabochon cuts to maximize the surface area where the color play is visible.
• Clarity: While some inclusions are acceptable, excessive inclusions that detract from the stone's beauty or transparency are less desirable.

Buying Guide

When purchasing labradorite jewelry, consider the following:

• Observe the Labradorescence: View the stone from different angles and under various lighting conditions to appreciate its full color spectrum and brilliance.
• Check for Even Color Distribution: Look for stones where the colors are evenly distributed across the surface, rather than concentrated in small patches.
• Consider the Setting: Labradorite's moderate hardness makes it suitable for earrings, pendants, and bracelets. For rings, protective settings like bezel settings are recommended to minimize the risk of chipping or scratching.
• Body Color Contrast: A dark body color usually enhances the visibility of the labradorescence.
• Authenticity: Ensure you are purchasing genuine labradorite, as some treated feldspars or synthetic materials may be misrepresented.

Price Range & Value Factors

The price of labradorite varies significantly based on the quality of its labradorescence. Factors influencing value include:

• Intensity and Spectrum of Color: The most brilliant and broad-spectrum stones command higher prices.
• Dominance of Blue and Green: While a full spectrum is beautiful, stones with a strong, dominant blue and green play-of-color are often most sought after and valuable.
• Size: Larger stones of comparable quality will generally be more expensive.
• Cut and Polish: A well-executed cabochon cut that maximizes the stone's beauty is essential.
• Clarity: Fewer visible inclusions generally increase value.

While not as expensive as precious gemstones like diamonds or sapphires, high-quality labradorite, especially spectrolite, can be quite valuable. Prices can range from a few dollars per carat for lower-quality stones to hundreds of dollars per carat for exceptional, large specimens with intense, full-spectrum labradorescence.

Care and Maintenance

Labradorite requires careful handling due to its moderate hardness and potential cleavage planes.

• Avoid Harsh Chemicals: Do not expose labradorite to household cleaners, acids, or other harsh chemicals.
• Protect from Impact: Store pieces separately to prevent scratching and avoid wearing them during strenuous activities.
• Gentle Cleaning: Clean with a soft cloth and mild, soapy water. Rinse thoroughly and dry with a soft, lint-free cloth.
• Avoid Ultrasonic Cleaners: These can cause damage or cracking due to vibrations.

Pros and Cons

Pros:

• Unique and mesmerizing play-of-color (labradorescence)
• Wide range of colors and patterns
• Relatively affordable compared to many other colored gemstones
• Versatile for use in various jewelry designs

Cons:

• Moderate hardness (6-6.5 Mohs) requires careful wear and protection
• Can be prone to cleavage, making it brittle
• Inclusions are common and can affect transparency
• Labradorescence can be directional, meaning it is best viewed from certain angles

Famous Examples

While specific famous pieces of labradorite jewelry are less documented than those made with diamonds or sapphires, the stone's unique beauty has made it a favorite among jewelry artists and collectors seeking distinctive pieces. The discovery in Labrador, Canada, and the admiration for its mystical qualities continue to inspire its use in contemporary fine jewelry.

Common Misconceptions

One common misconception is that the colors in labradorite are the same as those found in opals or other iridescent gemstones. While they share a similar visual effect, the cause is different. Opal’s iridescence is due to light scattering from microscopic spheres, while labradorite’s labradorescence is caused by light diffraction from internal lamellar structures. Another misconception is that all labradorite has the same quality of labradorescence; in reality, the intensity, color range, and coverage vary dramatically.

Related Terms

• Feldspar
• Labradorescence
• Cabochon
• Plagioclase
• Spectrolite
• Gemstone Hardness
• Play-of-color

FAQs

What is labradorite best known for?

Labradorite is best known for its spectacular iridescent display of colors, known as labradorescence, which flashes and shifts as the stone is viewed from different angles.

Is labradorite a good gemstone for everyday wear?

While beautiful, labradorite has a moderate hardness (6-6.5 Mohs) and can be brittle. It is best suited for jewelry that is less likely to be bumped or scratched, such as earrings or pendants. For rings, protective settings and careful wear are recommended.

How can I tell if labradorite is real?

Genuine labradorite will exhibit labradorescence. Be wary of stones with overly uniform or artificial-looking colors. While gemological testing is the most accurate method, observing the characteristic play-of-color and learning common inclusions can help identify fakes.

What colors can labradorite have?

The body color of labradorite is typically dark gray, brown, or black. The labradorescence can display a wide spectrum of colors, most commonly blues and greens, but also yellows, oranges, purples, and even reds.

Is labradorite valuable?

The value of labradorite depends heavily on the quality of its labradorescence. High-quality stones with intense, broad flashes of spectral color can be quite valuable, while those with weaker or limited color are more affordable.