Today's gem:
Diamond
Formula: C
Color: Colorless, yellow, cognac, brown, champagne, or black; less commonly other colors.
Hardness: 10
The hardest natural substance known, named after the Ancient Greek adamas (diamond). Few types of impurity can contaminate it, and the high refractive index, fluorescence and dispersion makes it very prized. Diamonds are the birthstones of April and historically said to bring victory and protection against insanity, diseases and enchantments. These gems are also associated with weddings and marriage.
Representation on media:
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