Hmm this is interesting. I found out only recently about baked stones, when I was told a citrine of mine was baked from amethyst. Not entirely sure I like the idea of changing things from their natural state
Baked, irradiated, coated, glass filled, oil filled... There's a myriad of ways to change the appearance of a stone, all with the goal of making it look like something it isn't. Look at "rainbow topaz" for a rather blatant example of what coatings can do to a more mundane stone.
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