Demon's Souls: Pure Bladestone

Two quick runs to farm Pure Bladestone in Demon's Souls for PS3. The second run is much, much more likely to yield a quality drop. Don't bother with the first run, it's a waste of time unless you want to collect dozens of Uchigatanas or throw away hundreds of Shards. Also don't bother with Luck or the Large Sword of Searching - neither will help get a Pure Bladestone.