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Collector: Pearls of Yu'lon
Restore 20 Pearls of Yu'lon.
Collector: Pearls of Yu'lon requires you to restore the 
Pearl of Yu'lon artifact 20 times through Pandaren Archaeology.
Farm Pandaren Digsites
Excavate Pandaren digsites across Pandaria to collect Pandaren Archaeology Fragments, prioritizing these over Mogu digsites when possible, as the Pearl of Yu'lon is among the rarest Pandaren artifacts to solve.
Restore Pearl of Yu'lon
Each restore requires 60 Pandaren Archaeology Fragments, and you can use up to two 
Pandaren Pottery Shards per solve to contribute +40 fragments each, reducing the fragments you need to gather manually.
Repeat Until 20 Restores
The Pearl of Yu'lon is the rarest of the Pandaren artifacts, and reaching 20 restores may require approximately 270 or more total Pandaren projects completed; expect to solve many other Pandaren artifacts, such as the Empty Keg of Brewfather Xin Wo Yin, far more frequently along the way.
Tips
If only Mogu digsites are available, use the digsite randomizer item to cycle in Pandaren digsites instead.
Each Pandaren Pottery Shard used counts as +12 fragments toward a solve (up to 2 per project), so stockpiling them reduces total fragment farming per restore.