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Diamonds are among nature’s most precious and beautiful creations.
Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine.
The essence of purple, amethyst is beautiful enough for crown jewels, affordable enough for class rings.
The name “sapphire” can also apply to any corundum that’s not ruby red, another corundum variety.
Ruby is the most valuable variety of the corundum mineral species, which also includes sapphire.