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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1Earth Antiques & Appraisals Magazine > Jewelry > Expert Tip: Gemstones > Rose Quartz

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Rose Quartz
  ROSE QUARTZ, the pink variety of quartz

VARIETY INFORMATION:
VARIETY OF: Quartz , SiO 2 , Silicon Dioxide. 
USES: Gemstone and ornamental stone. 
COLOR: various shades of pink to a rosy-red. 
INDEX OF REFRACTION: 1.544-1.553 
BIREFRINGENCE: 0.009 
HARDNESS: 7 
CLEAVAGE: none 
CRYSTAL SYSTEM: trigonal 
SPECIMENS 

   
Rose quartz is one of the most desirable varieties of quartz. The pink to rose red color completely unique, unlike any other pink mineral species. The color is caused by iron and titanium impurities. 
Rose quartz is used as an ornamental stone and as a gemstone. Although rose quartz is usually too cloudy to be used as a cut gemstone, a few exceptional pieces are found with enough clarity and color to make fine gems. Most gemmy rose quartz is used as cabochons where the clarity is not as important as the color. Rose quartz is also a very attractive ornamental stone and is carved into popular spheres, pyramids, obelisks, figurines and ornate statues. 

Rose quartz is found in Madagascar, India, Germany and several localities in the USA. Much rose quartz was extracted from a famous site near Custer, South Dakota, but now, most of the worlds supply of good carvable rose quartz comes from Brazil. 

Brazil is also the only source of true well formed crystals of rose quartz. All rose quartz was believed to be only massive, found primarily in the cores of pegmatites. This lack of crystals is somewhat of a curiosity because quartz crystallizes into well formed crystals in all its other macroscopic varieties. So amazing are the rose quartz crystals that the first ones discovered were dismissed as fakes by mineralogists from around the world. 

If rutile needles are present in the rose quartz then a star effect or asterism is sometimes seen. The star is best seen when light is viewed through the rose quartz. This is different from asterisms in most other gemstones, such as ruby and sapphire, where the stars are seen when light is shown on the gems. 

Rose quartz is only one of several quartz varieties. Other varieties that form macroscopic (large enough to see) crystals are as follows: 

Amethyst is the purple gemstone variety. 
Citrine is a yellow to orange gemstone variety that is rare in nature but is often created by heating Amethyst. 
Milky Quartz is the cloudy white variety. 
Rock crystal is the clear variety that is also used as a gemstone. 
Smoky quartz is the brown to gray variety. 

SiO 2 , Silicon Dioxide

Gemstone Composition Crystal System Density Hardness Refractive index Treatments
Rose Quartz SiO2          

Garnet Group

Almandite
Andradite
Grossular
Pyrope
Spessartite
Uvaravite

Tsavorite is often confused with:

Peridot
Demantoid
Emerald
Tourmaline
Glass
Plastic

 

 

 



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