Emerald: The World's Most Popular Green Gem, May Birthstone - Geology.com
https://geology.com/gemstones/emerald/
WEBADVERTISEMENT. What Are Emeralds? Emeralds are gem-quality specimens of the beryl mineral family with a rich, distinctly green color. They are found in igneous, metamorphic, and sedimentary rocks in a small number of locations worldwide. For over 5000 years, emeralds have been one of the most desirable and valuable colored stones.
DA: 38 PA: 2 MOZ Rank: 89