I can't complete the quest for one of the npcs that want gold ore, mammoth tusks and flawless sapphires. In 100+ hours of gameplay, I've never seen one. Any possible locations they could be in the world that's been known to have them spawn?
"Kidnapping is wrong! I'll be careful not to kidnap anyone."
Go to the farm outside of Riften. I forget the name. There is an NPC named Dravin there. He sends you on a quest to retrieve his bow from the Ratway. Find his bow and take it back to him. He gave me several gems including 3 flawless sapphires for doing it. So good luck.