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Star Ruby @ Jewel Info 4 U
By: Nasrina Parvin KhanINTRODUCTION OF RUBY
'Red' is the color of passion, love,
brightness and power. Every women as
well as men are fascinated with this
color .If we get a gem with color
'red' it will be a pleasing
experience for us. It will fulfill
our desire to get a gemstone with
red.
Is there any gemstone in 'red'? Yes,
it is "ruby''. Ruby is the most
passionate as well as most precious
gemstone in this Earth. The most
important characteristic of this gem
is its amazing color.
The name ruby was came from the
Latin word 'rubens' which means red.
This excellent colored gemstone is
considered as the King of Gemstone.
India was considered as the
classical country of rubies for a
long time. In the Sanskrit (on of
the classical languages of India)
ruby is called 'ratnaraj' which
translates as "King of the
Gemstones".
Other important characteristics of
ruby are its excellent hardness and
brightness. On the Moh's scale this
splendid stone shows a hardness of
9, just after the diamond, the
gravity is also high of this gem. It
is 3.97- 4.05.
 Rarity is another important thing
about ruby. Ruby is an extremely
rare gemstone. Especially finer
quality ruby is very rare.
Ruby is the red variety of the
corundum mineral. Actually the pure
corundum has no color. Inclusions of
little bit of other elements like,
chrome, iron, titanium or vanadium
are responsible for creating the
color 'red'. The ingredients of ruby
are Aluminium oxide (Al2O3) and
chrome with smallest proportions of
other trace elements. But all the
things are depends on the respective
occurrence. Actually chrome is the
element, which awarding ruby it's
amazing color deep inside the core
of Earth, since the creation of the
gemstone.
Ruby occurs in metamorphic rocks,
diplomatic marble and gneiss.
Usually corundum mined from
secondary alluvial deposits. Very
rarely, it is mined from primary
deposits.
There are various kinds of rubies.
But the most rare, valuable and
attractive form of rubies is Star
Ruby.
WHAT IS STAR RUBY?
STAR ruby is a rare variety of
rubies. Nearly 3 stars are
discovered in every 100 faceted
corundum mined. Fine stars are more
rare.
Star Ruby is a type of rubies, which
shows the special optical phenomenon
"asterism".
"Asterism" is a phenomenon by which
a star shaped light effect has been
shown across the surface of the gem
through the reflection or
transmission of light.
Star Ruby is one of the most popular
star gems, which shows an
illuminated, wavy star bellow the
surface of the crystal.
Usually Star Ruby shows the six
legged star effect. But it can shows
four to twelve rays depending on the
crystal system of the gems. Twelve
rays star effect in ruby is very
occasional.
WHAT CAUSES STAR EFFECT
Star effect or "asterism" is caused
by the dense inclusions of tiny
fibers of foreign particles in gems.
Generally, these inclusions are the
reason of the reflection of light
and form a wavy star like formation,
which moves around when the mineral
is rotated. All the inclusions in
the gem are form via exsolution.
Solid crystal inclusions found
within the corundum ruby. Some
rubies leave holes or empty areas in
the host, which filled with liquid,
gas or solid. Reflection creates
from fibers or fibrous cavity in the
crystal.
The inclusions must be long, very
thin needle like which called as
'rutile'. "Asterism" is produced
when the light is concentrate into 3
rays that intersects at right angles
to the direction of the needles.
Thus we get a six-rayed star. Small
needles of rutile sometimes called
'silk' are oriented inside the
minerals in the direction of the
crystal growth system. There is
relationship between the gem's
growth and the number of rays
produced by the reflected light.
The arrangements of needles in a
hexagonal pattern produced six-rayed
'asterism'.
Exsolved inclusions form a pattern
in the host mineral to form a star.
This pattern remains same in case of
ruby. The rays of star should cross
at the top of the ruby and must be
distinct.
QUALITY OF A STAR
The sharpness and the size of the
star in ruby depend on the quality
and quantity of rutile needles. We
get a better star in ruby when the
rutile packed more densely. Longer
needles also produce a better star
than the tiny particles. When the
quantities of needles are much more,
ruby turned into a low translucent
stone and lack 'asterism'. It also
harms the color of ruby.
CUTTING OF A STAR RUBY
Cutting is very important to exhibit
the star effect in ruby. Proper
cutting helps to extracts the beauty
of the gem. To display the star
effect in best way, a ruby must be
cut as cabochon with the girdle,
parallel to the needles. Medium to
high cabochons need to be cut to get
a perfect star in ruby. The domed
must be round or oval shaped.
COLOR OF STAR RUBY
The color of ruby is red. But the
Star Ruby usually is not red. The
Star Ruby available in red/pink or
pink/red. Star Ruby from Sri Lanka
is purplish brown. Generally the
pinks have the best stars. Star Ruby
with color 'red' is very very rare
and costly. Red ruby with a perfect
star are quiet impossible to locate.
COST OF STAR RUBY
The cost of red Star Ruby can reach
at $50,000 per carat. Generally,
three-carat pinks Star ruby sell for
about $2000+ per carat whereas reds
begin at about $5000 per carat.
The value of a Star Ruby influenced
by the intensity and attractiveness
of the body colors as well as the
strength and sharpness of the star.
All six legs of the star should be
straight and prominent.
OCCURRENCE OF STAR RUBY
Finer qualities Star Rubies mainly
come from Mogok of Myanmar and Sri
Lanka. Mogok material is the most
fascinating. In the other hand
African and Thai corundum do not
produce stars due to the lack of
rutile in the host material.
FAMOUS STAR RUBY
The most famous spectacular Star
Ruby is over 138-carat Rosser Reeves
Ruby, which can be seen at the
Smithsonian. It was mined in Sri
Lanka.
More Resources
Ruby mineral specimens
Buy Star ruby at gemhut
Burma Star Ruby
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