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Not right now, AFAIK. It wouldn't be hard to design though; all you need to decide is what level of magical enhancement bonus would be needed to overcome it. (Since you can overcome cold iron, silver and adamantine with +3, +3 and +4 enhancement bonuses, respectively.)
You could also have /wood and /obsidian, if you like.
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I know that there is one monster with DR/Glass or Obsidian.
The Fext is a monster that comes from Slavic mythology, most notably during the 17th century and the 30 years war. The general gyst of the story is that some enemy commanders just seemed so invulnerable, that people presumed that they were some kind of monster.
The idea that they are vulnerable to glass bullets is kind of a reassuring thing saying 'if we prepared, we could take him'....without it being a type of ammunition that anyone would ever actually use (hey, can't make it easy, or the guys would have never survived long enough to get their reputation).
So anyway, since there are officially weird monster like that, feel free to get a little creative. Bronze is probably less painful than gold though (bronze is just fragile, which is solved by making it masterwork, and can't be used for most 2 handed weapons. Gold actively messes you up by having a -2 to damage rolls). Just be sure to have ways for the players to realize that this is the case (The Daily Bestiary explored the idea a bit with the Fext by discussing how a land where everyone carried daggers made of glass would be memorable). Generally, having the players see this, and then getting into a simple 'warm up fight' where the usual tools don't work should suffice.