The Diadem has 6-attempt unspoiled nodes that have no obstructions to clear, and that occasionally offer one of +1 attempt, +2 attempt, and +2 yield procs if your stats are high enough. With a +2 attempt proc, Kings Yield 2, and the +5% gather buff, you can get 24 of an item, of which 9 will be guaranteed HQ. With a +2 yield proc and the same bufs, you can get 30 of an item, 5 of which are guaranteed HQ.

The new Diadem is awesome. You can hit your weekly gathering red scrip limit easily in a single run, or gather 2400+ blue scrip (48+ Blue Rowena's tokens) worth of collectables if you're trying to get the Folklore books (99 tokens each) or need Crystal Sands (5 tokens per sand) for your relic.