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.
Below, all of the treasures available in Skyward Sword. Click on a link to view that treasure's page, each of which will include: the location of treasure or the enemy from which it can be obtained; the Sale Price if you sell that treasure to Rupin; and the Upgrades the treasure can be used in. Along with this, you will also find a screenshot showing the item; a image of the treasure from the game; and a short description of the treasure.