The Love is in the air event dungeon ( The Crown Chemical Co ) bosses drop 480 ilvl necklaces that are able to be DE'd into Sha Crystals. The 3 bosses themselves only take about 2-3 minutes to kill and the dungeon can be queued for repeatedly. Sha Crystals sell for about 350+ gold depending on your server. This is most likely unintended so farm them while you can!