Gems are made of minerals
Emeralds are made of Beryllium aluminum silicate, and are sometimes mixed with sodium, lithium, and cesium. The gemstones would be markers for the mineral riches of the area.
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Emeralds are made of Beryllium aluminum silicate, and are sometimes mixed with sodium, lithium, and cesium. The gemstones would be markers for the mineral riches of the area.