Skyward Sword Treasure
When you defeat enemies they will normally drop hearts or rupees. Sometimes, they will drop items called Treasure. These items can be collected and used to upgrade various weaponry and other items, such as swords, shields, and equipment. This can be done at Gondo's Scrap Shop in the Bazaar as long as you have enough of the Treasure required.
Not all enemies drop treasure, however. Some treasure can only be found on the ground in a specific region or time as well. The odds of finding treasure will increase if you have the Treasure Medal in possession.
In addition to upgrading your gear, treasure can also be sold. You can enter Rupin the Item Shop Owner's house at night, and he will buy treasure from you for a cheap price.
Listed below are all of the treasures available in Skyward Sword. You can click on a link to view more information about that treasure, including a screenshot showing the item; an image of the treasure from the game; and a short description of the treasure.