What is Spinel?
Spinel is a magnesium aluminum oxide mineral that forms in a variety of colors, including red, blue, pink, purple, and black. Its name is derived from the Latin word "spina," meaning thorn, referring to its sharp crystal formations. Historically, spinel was often confused with ruby due to its similar appearance, and some of the most famous "rubies" in royal collections are actually spinels. Today, spinel is celebrated as a gemstone in its own right, prized for its brilliance, durability, and vibrant hues.
Uses
Spinel is a versatile gemstone with a wide range of uses. Its primary application is in jewelry, where it is cut into faceted stones for rings, earrings, necklaces, and bracelets. Due to its hardness (8 on the Mohs scale), spinel is durable enough for everyday wear, making it an excellent choice for engagement rings and other fine jewelry.
Beyond adornment, spinel has industrial uses. Its synthetic form is used in lasers, optical instruments, and even as a refractory material due to its high melting point. However, it’s the natural spinel’s beauty and rarity that make it a favorite among gemstone enthusiasts.
Origin
Spinel is found in various locations around the world, with some of the most notable deposits in Myanmar (formerly Burma), Sri Lanka, Tanzania, Vietnam, and Tajikistan. Myanmar has historically been the most famous source of high-quality red spinels, often referred to as "Balas rubies." Sri Lanka is known for its vibrant blue and pink spinels, while Tanzania produces stunning neon-blue and purple varieties.
The gemstone’s formation is closely tied to metamorphic rocks and alluvial deposits, where it crystallizes under high pressure and temperature conditions. This geological process contributes to its exceptional clarity and color saturation.
The Colors of Spinel and Their Prices
One of the most captivating aspects of spinel is its wide range of colors. Each hue has its own unique appeal and price range:
Red Spinel: Often compared to rubies, red spinel is the most valuable and sought-after variety. Prices can range from $500 to $5,000 per carat, depending on size, clarity, and origin.
Blue Spinel: Known for its deep, sapphire-like tones, blue spinel is highly prized. Prices typically range from $200 to $2,000 per carat.
Pink and Purple Spinel: These delicate hues are popular for their feminine appeal. Prices range from $100 to $1,500 per carat.
Black Spinel: With its sleek, modern look, black spinel is more affordable, usually costing between $10 and $100 per carat.
Other Colors: Spinel also comes in orange, yellow, and green, with prices varying based on rarity and quality.
The Properties of Spinel
Spinel is renowned for its exceptional physical properties. Here are some key characteristics:
Hardness: With a Mohs hardness of 8, spinel is durable and resistant to scratches, making it ideal for jewelry.
Luster: Spinel has a vitreous (glass-like) luster that enhances its brilliance.
Clarity: High-quality spinel is often eye-clean, meaning it has no visible inclusions.
Treatments and Enhancements of Spinel
Unlike many gemstones, spinel is rarely treated or enhanced. Most spinels on the market are natural and untreated, which adds to their appeal and value. However, some stones may undergo heat treatment to improve color or clarity. This process is generally stable and does not significantly affect the gemstone’s value.
It’s important to purchase spinel from reputable dealers who disclose any treatments. Synthetic spinel is also available, but it is primarily used for industrial purposes rather than jewelry.
