Elegance (noun)

1. The quality of being graceful and stylish in appearance or manner.
2. The quality of being refined and tasteful in design or behavior.
3. The quality of being pleasingly ingenious and simple.

Origin:

From latin elegantia, from elegantem "choosing well".

Examples:

1. She exuded elegance in her poise and manners.
2. The dress had an elegance that was timeless.
3. The building had an elegance that was both modern and classic.
4. The solution was elegant in its simplicity.
5. His writing had an elegance that was captivating.