Gilt, as an adjective, means covered with gold (from the verb gild).
- She is wearing an elaborate gilt necklace to the party.
Gilt, as a noun, refers to a thin gold covering or layer.
- Over the years much of the gilt wore away from the necklace.
Guilt, a noun, is the responsibility for a wrongdoing or error.
- The prosecutor proved the accused’s guilt in the crime.