April Birthstone - Diamond

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Diamond fact file
Crystal Structure: isometric
Chemical Composition: Carbon
Hardness: 10 MOHS
Refractive Index: 2.417
Colors: colorless, yellow, black, red, green, purple, blue, pink

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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