I need quite a bit to finish last levels on all LP's. Citrine, amethyst,voodoo,topaz,diamond,ruby,pearl,opal, aquamarine,peridot, sapphire,emerald. Ranging from 13-86. I've been sailing northern sea and that hasn't been helping. Should I just sail east and max out the journey or just pick one item I need and just send the ship out for that on each map with shorter sail times?