Not to be a smartass, but I'd guess that they mean a treatment that enhances the hue of a stone. That's not a specific treatment type, so it's probably something they're ashamed to say by name: dying, Be diffusion, colored epoxy filling, smoke treatment, etc. Irradiation and heat are also able to enhance the color, but online I've usually seen irradiation referred to as 'heat' and heat referred to as 'no treatment' if they aren't labelled accurately.
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