Additional Properties

Crystal System ? Isometric

Refractive Index ? 1.712 - 1.736

Double Refraction ? None

Transparency ? Transparent to translucent

SG ? 3.5 - 3.7

Luster ? Vitreous

Cleavage ? None, but may exhibit slight parting

All About

Spinel is a gemstone that comes in a variety of colors. Pure Spinel is colorless, but impurities are responsible for the wide range of colors. The most valuable and desirable Spinel color is a deep blood red, though blue, yellow, orange, pink, and purple colors also make fine gemstones. Spinel is often fluorescent in ultraviolet light, and this can be helpful in its identification.

Fine red Spinel is actually rarer than Ruby of equal color. However, its  is an undervalued gemstone, with its cost is about 30% lower then comparable Ruby. The scarcity of good Spinel is the reason for its lack of demand and popularity. Gem Spinel is in very limited supply, and therefore jewelry companies and gem cartels don't really market this gemstone to the consumer. This inhibits Spinel from being a more mainstream gemstone.

Spinel is easily synthesized, and can be made into any color by adding impurities. Synthetic Spinel is often simulated to replicate many other gemstones such as Diamond, Sapphire, and Zircon. Because of the abundance of synthetic Spinel, one must always be careful only to purchase this gemstone from reputable dealers. Almost all colorless Spinel gemstones are synthetic, as it rarely occurs colorless in nature.

Uses

? The deep-red variety, often called Ruby Spinel, is the most prized form, and is a very good substitute for Ruby. Spinel is also an important pink gemstone. The opaque, black variety, known as Pleonast, has a good luster and is used as a black gemstone.

Spinel naturally occurs in octahedral crystals. In well-shaped red crystals, gem cutters may even out a crystal into a perfect octahedron. These "crystals" are occasionally be worn in jewelry without any further faceting.

Other Names

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• Spinell

Varieties

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• Almandine Spinel  -   Spinel with a violet to violet-blue color.
  
• Balas Ruby  -   Spinel with a pink to pale red color.
• Blue Spinel  -   Light to dark blue variety of Spinel.
• Flame Spinel  -   Orange to orange-red Spinel.
• Gahnospinel  -   Zinc-rich form of Spinel, usually with a dark green to greenish-black color.
  
• Picotite  -   Brown form of Spinel.
  
• Pleonast  -   Opaque, dark blue or green to black variety of Spinel.
• Rubicelle  -   Yellow to orange form of Spinel.
• Ruby Spinel  -   Ruby-red variety of Spinel.

Treatments & Enhancements

? Natural Spinel gemstones are not treated or enhanced.

Spinel Sources

? The most outstanding Spinel in size, color, and quality is from Burma. Other sources of gem Spinel are Sri Lanka, Cambodia, Vietnam, Thailand, Tadjikistan, Afghanistan, Pakistan, Tanzania, and Madagascar.

Similar Gemstones

? Red Spinel can be identical in appearance to Ruby. However, Spinel is usually lighter in color, and the deep-red Spinel is usually more of a brick-red then the Red of Ruby which has a slight blue or purple tinge to it. However, only optical properties and hardness can truly distinguish these two gemstones. Red Spinel can also closely resemble red Tourmaline and dark red Spinel may resemble Garnet.

Blue Spinel may resemble Zircon, Topaz, and Sapphire; and pink Spinel may resemble Morganite, pink Topaz, and pink Tourmaline. Purple Spinel may appear similar to Amethyst, though Spinel is usually bluer in tone than Amethyst.

Spinel Photos

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Spinel in the Rough Photos

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Spinel Jewelry Photos

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Additional Resources

• The mineral Spinel
• The gemstone Ruby