Black Spinel

Along with Peridot, Sardonyx Spinel is also a birthstone for August.

Spinel is a fascinating and highly valued gemstone that has a rich history and a variety of colors, making it popular among gem enthusiasts and collectors. Here are some key points about spinel:

History and Lore

• Ancient Recognition: Spinel has been used in jewelry for centuries and was often mistaken for other gemstones like ruby and sapphire. Some famous "rubies" in historical crown jewels are actually spinel.
• Famous Examples: The Black Prince’s Ruby in the British Crown Jewels and the Timur Ruby, also in the British Crown Jewels, are both large red spinels.

Physical and Chemical Properties

• Composition: Spinel is a magnesium aluminum oxide (MgAl₂O₄).
• Crystal Structure: It crystallizes in the isometric system, typically forming octahedral crystals.
• Hardness: Spinel has a hardness of 8 on the Mohs scale, making it quite durable for jewelry.
• Luster and Transparency: It has a vitreous luster and can be transparent to opaque.

Colors

• Variety: Spinel is known for its wide range of colors, including red, pink, blue, purple, orange, and even black. The color is determined by the trace elements present during its formation.
• Most Valuable: Red spinel, colored by chromium, is often the most valuable and sought-after, sometimes rivalling rubies in beauty and price.
• Cobalt Blue Spinel: This is another highly prized variety, known for its vivid blue color.

Geographic Sources

• Historical Sources: Historically, spinel was mined in regions like Myanmar (Burma), Sri Lanka, and Afghanistan.
• Modern Sources: Today, significant sources also include Vietnam, Tanzania, and Madagascar.

Uses in Jewelry

• Versatility: Due to its hardness and range of colors, spinel is used in various types of jewelry, from rings and earrings to necklaces and bracelets.
• Fashion Trend: Recently, spinel has gained popularity in the jewelry market for its beauty and the fact that it’s a relatively affordable alternative to rubies and sapphires.

Care and Maintenance

• Durability: While spinel is quite durable, it should still be protected from hard knocks and extreme temperature changes.
• Cleaning: It can be cleaned with warm soapy water and a soft brush. Ultrasonic and steam cleaners are generally safe for spinel.

Spinel’s beauty, range of colors, and rich history make it a unique and desirable gemstone for both collectors and jewelry enthusiasts.