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April Birthstone - Diamond
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Diamond fact file
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Crystal Structure: isometric
Chemical Composition: Carbon
Hardness: 10 MOHS
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Refractive Index: 2.417
Colors: colorless, yellow, black, red, green, purple, blue, pink
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Diamond, the April birthstone, needs no explanation. The hardest mineral found
on Earth, the diamond is also one of the most treasured of gems.
It is made of pure carbon formed under very high pressure underground. Although
diamond is the most popular and discussed gemstone, it has been in use for
a shorter time than any of the other gems that are commonly used in modern times.
The reason for this is because lapidaries did not learn to fashion diamond until
about the 15th Century when it was discovered that one diamond would abrade another.
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