SPINEL GEMSTONE

The Gemstone Spinel

spinel red

Spinel is most famous for its deep red variety that closely resembles Ruby. These two gemstones can be very difficult to
 distinguish. Until the late 19th century, there was no distinction made between Ruby and red Spinel, as they loo
k identical and are found in the same localities. Many famous old “Rubies” were discovered to be in fact Spinel.
 For example, the enormous “Ruby” that forms the centerpiece of the royal crown of England (the Black Prince’s Ruby)
was actually determined to be Spinel.
 
Chemical Formula MgAl2O4
Color White, Colorless, Blue, Red, Green, Yellow, Orange, Brown, Pink, Purple, Black
Hardness 7.5 – 8
Crystal System Isometric
Refractive Index 1.712 – 1.736
SG 3.5 – 3.7
Transparency Transparent to translucent

spinel

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.

Double Refraction None
Luster Vitreous
Cleavage None, but may exhibit slight parting
Mineral Class Spinel

grand 2

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