Dark red/purple leaves, almost black.
Gasterias are closely related to haworthias. They can handle lower light, indoors is ok as long as you have a bright window. These will stay darker with more light, and turn more green with less light.
Your plant will be similar to the one in the photos.
Size: About 2" across
Light: Part sun or bright indirect light, protect from hot afternoon sun
Water: Let dry between watering, water deeply
Soil: Use fast draining soil
Ships bare root. Pot and soil are not included.