[she seems to grumble a bit at that. Science and engineering are her things.] We reform light to meet our purposes. There are inherent limitations that vary within each individual, but I suppose all the glowing made it easier to simply refer to it as magic.

[we can either blame it on early Gems for the terminology or because it's easier for the average human or because it's a kid's show]

Made, formed. Either way, we're not derived from another Gem.