Tsavorite Alternate Birthstone for May A Variety of Grossular Garnet Tsavorite is a variety of green grossular garnet. It is one of the newest of the precious gemstones discovered in 1967. It occurs in shades of green ranging from spring-like pale green to intensely bluish green to deep forest green. Often compared to emerald, tsavorite is a superior choice in many ways. Tsavorite is not only more durable than emeralds, it is also more highly dispersive and refractive. Tsavorites are not treated with oils or resins as emeralds typically are.

 

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Chatelaine's Antiques & Appraisals Magazine > Jewelry > Expert Tip: Gemstones > Sapphire

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Sapphire
  

SAPPHIRE, the non-red variety of corundum

VARIETY INFORMATION:
VARIETY OF: Corundum , Al2O3 . 
USES: Gemstone. 
BIRTHSTONE FOR: September 
COLOR: various colors, except for red. 
INDEX OF REFRACTION: 1.76 - 1.78 
BIREFRINGENCE: 0.009 
HARDNESS: 9 
CLEAVAGE: none, although there is a rhombic parting 
CRYSTAL SYSTEM: trigonal 
PLEOCHROIC: strongly 

   
We sell natural sapphire mineral Specimens 
For jewelry, visit our Affiliates 
Sapphire is the non-red variety of corundum, the second hardest natural mineral known to mankind. The red variety of corundum is Ruby. Sapphires are well known among the general public as being blue, but it can be nearly any color, even colorless. White (or colorless but massive) sapphire would more properly be called corundum. The blue color is by far the most popular color for sapphire but orange-pink, golden, white, and even black have generated much interest in the gem trade. Oriented rutile crystal inclusions cause a six-pointed-star light effect (called asterism to form the popular Star Sapphire. 
Many of the finest watches have crystal faces made of artificial sapphire - these are extremely durable and scratch resistant.
Gemstone Composition Crystal System Density Hardness Refractive index Treatments
Sapphire Al2O3          

Garnet Group

Almandite
Andradite
Grossular
Pyrope
Spessartite
Uvaravite

Tsavorite is often confused with:

Peridot
Demantoid
Emerald
Tourmaline
Glass
Plastic

 

 

 



Waterford Crystal