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.