The Blessed Sword is an end game sword that uses yellow gems for crafting. It is called blessed because of its high enchant-ability.
To craft the blessed sword you start by making the blessed blade with three yellow gems.
The blessed hilt requires five yellow gems and four iron ingots.
To finish the sword simply place the blade and hilt together like so.
It does 16 damage and has 1,600 uses. It also has a slightly faster attack speed and the high enchantabilty means that you can get very good enchantments even with low levels. It can be repaired at an anvil with yellow gems.