My point is that the rules don't define exactly what "consumed" means, AFAIK; it's not a term of art in D&D. Saying the components simply vanish into nothingness is one interpretation, and probably the most common one, but not the only valid one. By the English definition, wood can be consumed in fire and still leave plenty of ash and stuff behind.kreynolds said:Material components, being consumed by spellcasting, simply go "POOF!". They're just gone. The rules do not state they can be recovered, but they do specifically state that the components are consumed.
But as you said yourself, an item used as a material component is consumed. Whatever "consumed" means, it always happens to material components. There's no such thing as a material component that doesn't get consumed, because consumption is part of the definition of a component (as opposed to a focus).But the description of the spell makes no mention whatsoever of the gem being altered. It doesn't state that the gem ceases to be a gem, or that its composition is changed at all.
IMO your interpretation contradicts the spell statblock, because you're saying the gem is really a focus. My argument is that the statblock means what it says, as long as you don't jump to conclusions about what the word "consumed" means.
I think my interpretation is more interesting than just assuming a typo in the statblock, but I won't insist that you're wrong. It's just another way of considering the problem.