Pebbles

"Very funny, Pink."

Pebbles are tiny Gems who inhabit the walls and floor of Pink Diamond's Palace. They made their debut in "Familiar".

Appearance
All the Pebbles are small in size and have shades of gray skin. They all have two black eyes. The Pebbles vary greatly in appearance, more so than most other Gem types. Their gemstones are round and come in different shades of gray.

Personality
The Pebbles were shown to be good friends with Pink Diamond and, by extension, Steven.

Whenever another Gem enters Pink Diamond's room, they all run and hide for unknown reasons.

Role
Pebbles appear to be servants and have the job of building and sewing things, such as beds and clothes. Like Bismuths, they are adept at shapeshifting their limbs into any tool they require.

Trivia

 * In "Catch and Release", Peridot uses "pebble" as an insult against Steven. This may be referencing the Pebbles and possibly implying that they have a low status on Homeworld, even lower than a Pearl. Squaridot also commonly uses "pebble" as an insult in Save the Light.
 * They resemble the mice from the Disney movie, Cinderella.
 * The Pebbles are voiced by Zach Callison and Susan Egan, the same voice actors who voice Steven and Rose Quartz/Pink Diamond respectively.
 * Unlike the other Gems seen thus far, pebbles are not named after a type of mineral. The term "pebble" is used to denote Grain Size rather than type/composition.
 * According to the Wentworth Scale, different types of pebbles have a particle size ranging from 2.5–0.157 inches.
 * They are the smallest non-corrupted gems to date.
 * It is implied during "Familiar" that Pink Diamond created some of the Pebbles to keep her company.