Star Stones (Asterism)
When parallel, needle-like inclusions, or tube-like channels, are oriented along two or more of the crystal faces of a mineral, and when that stone is cut as a domed cabochon, ...
Star Stone
A gemstone in which the phenomenon of asterism is visible.
Strain
Irregularity in the ordered structure of the atoms in a crystal.
Natural untreated star stones with good color and sharp stars are rare. Generally a six-rayed star is seen, rarely a 12-rayed one. Natural star stones are usually distinguished from synthetics by their coarser rutile needles.
Related Links : ...
Step or brilliant cut; heavily flawed or star stones are cut en cabochon.
Much ruby rough is shallow; many cut stones are shallow as a consequence. Because of strong dichroism, the best color is attained by cutting the table normal to the c-axis.
An additional problem is the total lack of light-scattering silk inclusions (star stones are not found). Although heat treatment does make improvements, it is not enough.
Astrologically speaking, your place on the Zodiac is more meaningful than your birth month for tapping into your "power," which has led to the creation of the following list of "Star Stones" related to the star under which you were born, ...
Traditionally, the sapphire is the birthstone of those born in the month of September, but it also is the star stone of those born under the signs of Pisces and Aquarius.
: Star Stones
Sec. III, Ch. 6: Spinel & Balas
Sec. III, Ch. 7: Emeralds
Sec. III, Ch. 8: Cat's Eye, The Chrysoberyl
Sec. III, Ch. 9: Alexandrite
Sec. III, Ch. 10: Opals
Sec. III, Ch. 11: Turquoise
Sec. IV, Ch.
Relatively few of the rubies mined today are candidates for cutting into star stones. The one essential element needed to produce the star effect is rutile.
The most popular gemstones seen in Retro Jewelry are aquamarine, citrine, topaz, large cabochon-cut rubies and sapphires (including star stones), golden beryl, peridots and tourmaline.
Opal is also listed as a birth/natal or star stone in the following birthstone tables:
Modern - October
Mystical - April
Ayurvedic - October
Sun Sign (Star Sign) - Aquarius
Sun Sign (Star Sign) - Libra
Hindu - March ...
These star stones range in colour from black (black stone sapphire) to blue (saphir etoile). There is also a variety known as alexandrite which is blue in daylight and red-violet in Artificial light.
Synthetic corundum stones can be produced as asterias (star stones), to simulate both star ruby and star sapphire by the addition of titanium oxide which, at high temperature, is precipitated as needles of rutile.
Legend: Ancient civilizations believed that star stones housed living spirits that were looking at you through those stars.
and 1900°C for an extended period of time will actually induce silk in stones which contain sufficient titanium in their chemical make up. During this extended heat, the titanium oxide precipitates out as tiny needles which create the star stone ...
The color is caused by iron impurities, and it can be heat treated to enhance the color. It is more expensive than blue topaz, but far less expensive than emerald. Asterism is possible in aqua producing either cats-eye or even star stones.
Streeter, a famous nineteenthcentury English jeweler, uses much the same criteria as Bauer regarding beauty and durability but reduces the list to diamond, ruby,
sapphire, and emerald, plus cat'seyes (chrysoberyl), turquoise, and star stones.
 See also: Stone, Star, Gem, Color, Gemstone
  
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