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Message: <blockquote data-quote="Celebrim" data-source="post: 416746" data-attributes="member: 4937">This is one of those questions that depends alot on whether you are using fantasy acid or realistic acid.  Fantasy acid has one attribute - potency.  The more potent it is, the more things it disolves and the more material it disolves relative to its volume.  Fantasy acids can disolve objects having several times there own volume.  Fantasy objects resist all acids equally.  Either the acid resistance is high enough to resist the acid, or it is not.Realism is much more complex.  Probably too complex.Let's suppose Al is right, and Black Dragons produce hydrocholoric acid or at least its equivalent (which is weird, because Chlorine is not an element; where is the Elemental Plane of Chlorine?)Some gems will do alot better than others.Diamond is fairly impervious to acids of all sorts.  However, it can be made to burn in the presence of certain oxidizing agents.Corundum and most of the other aluminum gems (like Alexandrite and I think Garnet) are essentially impervious to acids.  After that, it gets complicated.  Peridot will disolve almost instantly in hydrocloric acid. Topaz on the other hand is unaffected by hydrocloric acid, but will be disolved by nitric adic. Hydrofluoric acid will disolve opals, aquamarines, and amethyst.</blockquote>