- Main article: Caste System
Bismuths were builders for aristocratic members of society. As such they possessed a broad stature for intense physical labor, above-average resistance to heat and damage and hands capable of fluidly changing form without the need for typical Gem shapeshifting to fit a wide variety of purposes.
Bismuths have large, top-heavy builds, specifically made for heavy construction. Their hair is multi-colored and styled as dreadlocks. While their colors vary, all Bismuths have cool colors, for example, blue, purple, and green.
They all have hollow gems, the insides lined with multiple colors, similar to their hair.
- Bismuth - One of the original members of the Crystal Gems, she decided to work as a blacksmith against her initial orders, and later helped with the construction of Little Homeworld.
- Demantoid's Bismuths - Multiple Bismuths are seen working at Demantoid's colony, despite Steven sending a message across the universe urging for the dismantling of all colonies.
- For an unknown reason, the Bismuths in Unleash the Light are played by Miriam Hyman instead of Uzo Aduba.