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name:
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Ruby
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| gemstone variety:
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Corundum
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| trade name 1:
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Ruby
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| trade name 2:
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| trade name 3:
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| basic colour:
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red
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Colour :
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pinkish-red to a dark Ruby-red, brownish-red,
bluish-red (pigeon blood)
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Quality :
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the intensity of the red colour is important.The best
and most highly rated is the pigeon-blood red which is only
found in the famous Mogok-Valley in Burma. Second rated is
the pinkish-red from Vietnam followed by the red from Sri
Lanka. African Rubies are less desirable.
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History :
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Ruby is the classical Gemstone. Its name is derived
from the Latin 'rubeus' = red. Ruby was said to be the most
precious of the twelve stones God created when he created
all things and that this 'lord of gems' was placed on
Aaron's neck by God's command. Until today Ruby has been the
world´s most valuable gemstone. In fact, rubies are
much more valuable and rare than even top quality coulorless
diamonds.
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Curiosities / Saga :
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Countrys of Origin :
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Myanmar (Burma), Thailand, Vietnam, Sri Lanka, India,
Pakistan, Kenya, Tanzania, Madagascar
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Birthstone :
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July - Ruby
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Hardness :
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8
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Treatment :
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sometimes heat-treated
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Size :
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normally between 0.30 and 2.00 carats. Fine Rubies
above 2.00 carats are very rare and anything above 5.00
carats in fine quality is extremely rare
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Specific gravity :
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3.99 - 4.05
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Chemical Composition Formula :
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Al2O3 + Cr2O3
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Chemical Composition Name :
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Chrome- bearing alluminium- oxide
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Crystal system :
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trigonal
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Light refraction :
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1.760 - 1.773
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Double refraction :
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0.008
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