Yellow Gemstone

Source: npc/quests/quests_umbala.txt

1. In Umbala ritual stones, choose Insert a Yellow Gemstone.
2. If present, NPC accepts it for the ritual step.
3. Script performs delitem 715,1 and uses the gemstone in stage logic.
4. If missing, NPC says You don't have a Yellow Gemstone..
5. Keep extras because multiple checks can require it.