Emphasis is not a figurative device, but you can create emphasis by means of figurative devices, such as hyperbole, simile, and others.
http://www.tnellen.com/cybereng/lit_terms/
http://fictionwriting.about.com/od/glossary/g/figurative.htm
http://www.tnellen.com/cybereng/lit_terms/
http://fictionwriting.about.com/od/glossary/g/figurative.htm
She's thinner than paper.
1. Italics: Use italics to emphasize a particular word or phrase in your sentence. For example, "She is the *queen* of my heart."
2. Capitalization: Write the word or phrase you want to emphasize in all capital letters. For instance, "I am so HAPPY to see you!"
3. Underlining: Underline the word or phrase you want to emphasize. For example, "His dedication to his craft is *unmatched*."
4. Repetition: Repeat the word or phrase you want to emphasize to place significant emphasis on it. For instance, "She is talented, *talented* beyond measure."
5. Strong adjectives: Use powerful or intense adjectives to describe the noun you want to emphasize. For example, "The storm unleashed its *furious* wrath upon the city."
Remember that emphasis is used to highlight specific words or phrases and make them stand out or carry more weight in your writing.