The quality of being dark or dusky in color, especially in skin tone.
Swartness is a neutral term used to describe the color of someone's skin.
Examples:
Her swartness comes from her ancestors.
The artist captured the swartness of the model's skin tone.
Swartness is a beautiful feature of diversity.
The swartness of his skin made him stand out in the crowd.
Her swartness was so deep, it was like the color of the night sky.
The swartness of the chocolate made it look very tasty.