Grave² adj.
1. Requiring serious thought; momentous: a grave decision in a time of crisis.
2. Fraught with danger or harm.
3. Dignified and somber in conduct or character.
4. Somber or dark in hue.

Elegance n.
1. (a.) Refinement, grace, and beauty in movement, appearance, or manners.
(b.) Tasteful opulence in form, decoration, or presentation.
2. (a.) Restraint and grace of style.
(b.) Scientific exactness and precision.
3. Something elegant.