User blog comment:UnarmedGamerB1skuit/how rare is diamond in terraria/@comment-1427209-20130107061958

Like Mathmagician said, you really won't find them in abundance anywhere in the game. Although they are most common in the Underground Jungle, that doesn't mean that it won't take hours to find them. If you're looking for them to make White Torches, forget it. They might be bright, but they don't compare to the good old fashion regular torches. If you're really that worried about torches, you should look for Topaz instead. After you unlock hard mode, Cursed Torches will be all the rage.