<p>My guess is that the homeworld planet has some kind of substance that gives certain objects life-in this case, minerals and gemstones-and so when gemstones naturally form on the planet as like on earth, it would be given life and certain powers based on what type of gem it is. This theory comes from my kindergarted theory, where i think the homeworld gems create gems by growing gems that can be manually grown themselves (for example, amethysts can be grown by humans) and using the spider-pointy-robot thingy to inject the life supply and give the gemstones life. Great question! ;)
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